Albert Einstein Quotes
702 Quotes that Inspire the Wonder of the Universe

Explore the wisdom of Albert Einstein - a brilliant mind in history. Uncover his insights on success, mistakes, curiosity, and the science-religion connection. These quotes inspire us to challenge norms and embrace the wonders of the universe.

Albert Einstein was a German-born theoretical physicist known for his groundbreaking contributions to the field of physics. He developed the theory of relativity and made important contributions to quantum mechanics, reshaping our understanding of nature in the early 20th century. His equation E = mc2, which arises from relativity theory, is famous worldwide. In 1921, he received the Nobel Prize in Physics for his discovery of the law of the photoelectric effect. Einstein's work has had a significant influence on the philosophy of science and he is widely regarded as one of the greatest physicists of all time.

Throughout his career, Einstein made remarkable achievements. In 1905, often called his annus mirabilis (miracle year), he published four groundbreaking papers that explained the photoelectric effect, Brownian motion, and introduced his special theory of relativity. He also demonstrated the equivalence between mass and energy. In 1915, he proposed a general theory of relativity that incorporated gravitation into his system of mechanics. His cosmological paper in 1916 explored how general relativity could explain the structure and evolution of the universe. Additionally, Einstein contributed to statistical mechanics and quantum theory during this phase.

Despite these successes, Einstein faced difficulties later in his academic life. He opposed randomness in quantum theory while attempting to develop a unified field theory that combined gravity and electromagnetism but failed ultimately. Consequently, he became isolated from modern physics' mainstream during this time.

Born in Germany, Einstein moved to Switzerland in 1895 and acquired Swiss citizenship. He studied at Zurich's Federal polytechnic school before joining the Swiss Patent Office in Bern where he secured a permanent position. Einstein obtained his PhD from the University of Zurich in 1905. Later, he moved to Berlin and became director of the Kaiser Wilhelm Institute for Physics. When Adolf Hitler rose to power in Germany in 1933, Einstein decided to remain in the US, where he was granted American citizenship in 1940. He endorsed a letter to President Franklin D. Roosevelt urging research into nuclear weapons but viewed the idea with dismay.

✵ 14. March 1879 – 18. April 1955
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Albert Einstein: 702   quotes 289   likes

Famous Albert Einstein Quotes

Albert Einstein quote: “Try to become not a man of success, but try rather to become a man of value.”

“Try to become not a man of success, but try rather to become a man of value.”

As quoted by LIFE magazine (2 May 1955)
1950s
Variant: Strive not to be a success, but rather to be of value.

Albert Einstein quote: “Anyone who has never made a mistake has never tried anything new.”

“Anyone who has never made a mistake has never tried anything new.”

Variant: A person who never made a mistake never tried anything new.

“There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is.”

As quoted in Journal of France and Germany (1942–1944) by Gilbert Fowler White, in excerpt published in Living with Nature's Extremes: The Life of Gilbert Fowler White (2006) by Robert E. Hinshaw, p. 62. From the context http://books.google.com/books?id=_2qfZRp9SeEC&lpg=PP1&pg=PA62#v=onepage&q&f=false it seems that White did not specify whether he had heard Einstein himself say this or whether he was repeating a quote that had been passed along by someone else, so without a primary source the validity of this quote should be considered questionable.
Some have argued that elsewhere Einstein defined a "miracle" as a type of event he did not believe was possible—Einstein on Religion by Max Jammer (1999) quotes on p. 89 from a 1931 conversation Einstein had with David Reichinstein, where Reichinstein brought up philosopher Arthur Liebert's argument that the indeterminism of quantum mechanics might allow for the possibility of miracles, and Einstein replied that Liebert's argument dealt "with a domain in which lawful rationality [determinism] does not exist. A 'miracle,' however, is an exception from lawfulness; hence, there where lawfulness does not exist, also its exception, i.e., a miracle, cannot exist." ("Dort, wo eine Gesetzmässigkeit nicht vorhanden ist, kann auch ihre Ausnahme, d.h. ein Wunder, nicht existieren." D. Reichenstein, Die Religion der Gebildeten (1941), p. 21). However, it is clear from the context that Einstein was stating only that miracles cannot exist in a domain (quantum mechanics) where lawful rationality does not exist. He did not claim that miracles could never exist in any domain. Indeed, Einstein clearly believed, as seen in many quotations above, that the universe was comprehensible and rational, but he also described this characteristic of the universe as a "miracle". In another example, he is quoted as claiming belief in a God, "Who reveals Himself in the lawful harmony of the world."
As quoted in From Yale to Jail: The Life Story of a Moral Dissenter (1993) by David T. Dellinger, p. 418
Disputed
Variant: There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.
Variant: There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.

“Blind belief in authority is the greatest enemy of truth.”

Letter to Jost Winteler (1901), quoted in The Private Lives of Albert Einstein by Roger Highfield and Paul Carter (1993), p. 79 http://books.google.com/books?id=zY7FE9ZyDO0C&lpg=PP1&pg=PA79#v=onepage&q&f=false. Einstein had been annoyed that Paul Drude, editor of Annalen der Physik, had dismissed out of hand some criticisms Einstein made of Drude's electron theory of metals.
1900s
Variant: A foolish faith in authority is the worst enemy of truth.

Albert Einstein Quotes about life

“Only a life lived for others is a life worthwhile.”

In answer to a question asked by the editors of Youth, a journal of Young Israel of Williamsburg, NY. Quoted in the New York Times, June 20, 1932, pg. 17 http://select.nytimes.com/gst/abstract.html?res=F40617F83B5A13738DDDA90A94DE405B828FF1D3
Unsourced variant: Only a life in the service of others is worth living.
1930s
Variant: I believe in one thing—that only a life lived for others is a life worth living.

“Life is like riding a bicycle. To keep your balance you must keep moving.”

Letter to his son Eduard (5 February 1930), as quoted in Walter Isaacson, Einstein: His Life and Universe (2007), p. 367
1930s

“If A is success in life, then A = x + y + z. Work is x, play is y and z is keeping your mouth shut.”

Said to Samuel J Woolf, Berlin, Summer 1929. Cited with additional notes in The Ultimate Quotable Einstein by Alice Calaprice and Freeman Dyson, Princeton UP (2010) p 230
1920s
Variant: If A is success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut.

“Imagination is everything. It is the preview of life's coming attractions.”

Variant: Your imagination is your preview of life’s coming attractions.

“If you want to live a happy life, tie it to a goal, not to people or objects.”

As quoted by Ernst Straus in Einstein: A Centenary Volume by A.P. French (1980), p. 32.
Attributed in posthumous publications
Variant: "if you want to be a happy man, you should tie your life to a goal, not to other people and not to things." A quote from Ernst Straus' memoir of Einstein in Albert Einstein: Historical and Cultural Perspectives edited by Gerald Holton and Yehuda Elkana (1982), p. 420 http://books.google.com/books?id=CNuwE3NL1QgC&lpg=PP1&pg=PA420#v=onepage&q&f=false

Albert Einstein: Trending quotes

“Science without religion is lame, religion without science is blind.”

Source: Attributed in posthumous publications, Einstein and the Poet (1983), p. 94
Context: Religion and science go together. As I've said before, science without religion is lame and religion without science is blind. They are interdependent and have a common goal—the search for truth. Hence it is absurd for religion to proscribe Galileo or Darwin or other scientists. And it is equally absurd when scientists say that there is no God. The real scientist has faith, which does not mean that he must subscribe to a creed. Without religion there is no charity. The soul given to each of us is moved by the same living spirit that moves the universe.

Albert Einstein Quotes

“I have no special talents. I am only passionately curious.”

Ich habe keine besondere Begabung, sondern bin nur leidenschaftlich neugierig.
Letter to Carl Seelig http://en.wikipedia.org/wiki/Carl_Seelig (11 March 1952), Einstein Archives 39-013
1950s

“Wisdom is not a product of schooling but of the lifelong attempt to acquire it.”

From the same 24 March 1954 letter as above, p. 44
Attributed in posthumous publications, Albert Einstein: The Human Side (1979)

“Pure mathematics is in its way the poetry of logical ideas.”

1930s, Obituary for Emmy Noether (1935)
Context: Pure mathematics is, in its way, the poetry of logical ideas. One seeks the most general ideas of operation which will bring together in simple, logical and unified form the largest possible circle of formal relationships. In this effort toward logical beauty spiritual formulas are discovered necessary for the deeper penetration into the laws of nature.

“If you want your children to be intelligent, read them fairy tales. If you want them to be more intelligent, read them more fairy tales.”

Found in Montana Libraries: Volumes 8-14 (1954), p. cxxx http://books.google.com/books?id=PpwaAAAAMAAJ&q=%22more+fairy+tales%22#search_anchor. The story is given as follows: "In the current New Mexico Library Bulletin, Elizabeth Margulis tells a story of a woman who was a personal friend of the late dean of scientists, Dr. Albert Einstein. Motivated partly by her admiration for him, she held hopes that her son might become a scientist. One day she asked Dr. Einstein's advice about the kind of reading that would best prepare the child for this career. To her surprise, the scientist recommended 'Fairy tales and more fairy tales.' The mother protested that she was really serious about this and she wanted a serious answer; but Dr. Einstein persisted, adding that creative imagination is the essential element in the intellectual equipment of the true scientist, and that fairy tales are the childhood stimulus to this quality." However, it is unclear from this description whether Margulis heard this story personally from the woman who had supposedly had this discussion with Einstein, and the relevant issue of the New Mexico Library Bulletin does not appear to be online.
Variant: "First, give him fairy tales; second, give him fairy tales, and third, give him fairy tales!" Found in The Wilson Library Bulletin, Vol. 37 from 1962, which says on p. 678 http://books.google.com/books?id=KfQOAQAAMAAJ&q=einstein#search_anchor that this quote was reported by "Doris Gates, writer and children's librarian".
Variant: "Fairy tales … More fairy tales … Even more fairy tales". Found in Breaking the Magic Spell: Radical Theories of Folk and Fairy Tales by Jack Zipes (1979), p. 1 http://books.google.com/books?id=MxZFuahqzsMC&lpg=PP1&pg=PA1#v=onepage&q&f=false.
Variant: "If you want your children to be brilliant, tell them fairy tales. If you want them to be very brilliant, tell them even more fairy tales." Found in Chocolate for a Woman's Heart & Soul by Kay Allenbaugh (1998), p. 57 http://books.google.com/books?id=grrpJh7-CfcC&q=brilliant#search_anchor. This version can be found in Usenet posts from before 1998, like this one from 1995 http://groups.google.com/group/rec.music.beatles/msg/cec9a9fdf803b72b?hl=en.
Variant: "If you want your children to be intelligent, read them fairy tales. If you want them to be very intelligent, read them more fairy tales." Found in Mad, Bad and Dangerous?: The Scientist and the Cinema by Christopher Frayling (2005), p. 6 http://books.google.com/books?id=HjRYA3ELdG0C&lpg=PA6&dq=einstein%20%22want%20your%20children%20to%20be%20intelligent%22&pg=PA6#v=onepage&q=einstein%20%22want%20your%20children%20to%20be%20intelligent%22&f=false.
Variant: "If you want your children to be intelligent, read them fairy tales. If you want them to be more intelligent, read them more fairy tales." Found in Super joy English, Volume 8 by 佳音事業機構 (2006), p. 87 http://books.google.com/books?id=-HUBKzP8zsUC&lpg=PP1&pg=PA87#v=onepage&q&f=false
Disputed
Context: Fairy tales and more fairy tales. [in response to a mother who wanted her son to become a scientist and asked Einstein what reading material to give him]

“Few are those who see with their own eyes and feel with their own hearts.”

Variant: Small is the number of them that see with their own eyes and feel with their own hearts
Source: "Einstein's Reply to Criticisms" (1949), The World As I See It (1949), p. 66 of the edition at http://books.google.com/books?id=aNKOo94tO6cC&lpg=PP1&pg=PA66#v=onepage&q&f=false

“Being a lover of freedom, when the revolution came in Germany, I looked to the universities to defend it, knowing that they had always boasted of their devotion to the cause of truth; but, no, the universities immediately were silenced. Then I looked to the great editors of the newspapers whose flaming editorials in days gone by had proclaimed their love of freedom; but they, like the universities, were silenced in a few short weeks. Then I looked to individual writers who, as literary guides of Germany, had written much and often concerning the place of freedom in modern life; but they, too, were mute.Only the church stood squarely across the path of Hitler's campaign for suppressing truth. I never had any special interest in the church before, but now I feel a great affection and admiration because the church alone has had the courage and persistence to stand for intellectual truth and moral freedom. I am forced thus to confess that what I once despised I now praise unreservedly.”

Attributed in “The Conflict Between Church And State In The Third Reich”, by S. Parkes Cadman, La Crosse Tribune and Leader-Press (28 October 1934), viewable online on p. 9 of the issue here http://newspaperarchive.com/us/wisconsin/la-crosse/la-crosse-tribune-and-leader-press/1934/10-28/ (double-click the page to zoom). The quote is preceded by “In this connection it is worth quoting in free translation a statement made by Professor Einstein last year to one of my colleagues who has been prominently identified with the Protestant church in its contacts with Germany.” [Emphasis added.] While based on something that Einstein said, Einstein himself stated that the quote was not an accurate record of his words or opinion. After the quote appeared in Time magazine (23 December 1940), p. 38 http://www.time.com/time/magazine/article/0,9171,765103,00.html, a minister in Harbor Springs, Michigan wrote to Einstein to check if the quote was real. Einstein wrote back “It is true that I made a statement which corresponds approximately with the text you quoted. I made this statement during the first years of the Nazi-Regime — much earlier than 1940 — and my expressions were a little more moderate.” (March 1943) http://www.pbs.org/wgbh/roadshow/archive/200706A19.html
In a later letter to Rev. Cornelius Greenway of Brooklyn, who asked if Einstein would write out the statement in his own hand, Einstein was more vehement in his repudiation of the statement (14 November 1950) http://books.google.com/books?id=T5R7JsRRtoIC&pg=PA94: <blockquote><p>The wording of the statement you have quoted is not my own. Shortly after Hitler came to power in Germany I had an oral conversation with a newspaper man about these matters. Since then my remarks have been elaborated and exaggerated nearly beyond recognition. I cannot in good conscience write down the statement you sent me as my own.</p><p> The matter is all the more embarrassing to me because I, like yourself, I am predominantly critical concerning the activities, and especially the political activities, through history of the official clergy. Thus, my former statement, even if reduced to my actual words (which I do not remember in detail) gives a wrong impression of my general attitude.</p></blockquote>
: In his original statement Einstein was probably referring to the actions of the Emergency Covenant of Pastors organized by Martin Niemöller, and the Confessing Church which he and other prominent churchmen such as Karl Barth and Dietrich Bonhoeffer established in opposition to Nazi policies.
: Einstein also made some scathingly negative comments about the behavior of the Church under the Nazi regime (and its behavior towards Jews throughout history) in a 1943 conversation with William Hermanns recorded in Hermanns' book Einstein and the Poet (1983). On p. 63 http://books.google.com/books?id=QXCyjj6T5ZUC&lpg=PP1&pg=PA63#v=onepage&q&f=false Hermanns records him saying "Never in history has violence been so widespread as in Nazi Germany. The concentration camps make the actions of Ghengis Khan look like child's play. But what makes me shudder is that the Church is silent. One doesn't need to be a prophet to say, 'The Catholic Church will pay for this silence.' Dr. Hermanns, you will live to see that there is moral law in the universe. . . .There are cosmic laws, Dr. Hermanns. They cannot be bribed by prayers or incense. What an insult to the principles of creation. But remember, that for God a thousand years is a day. This power maneuver of the Church, these Concordats through the centuries with worldly powers . . . the Church has to pay for it. We live now in a scientific age and in a psychological age. You are a sociologist, aren't you? You know what the Herdenmenschen (men of herd mentality) can do when they are organized and have a leader, especially if he is a spokesmen for the Church. I do not say that the unspeakable crimes of the Church for 2000 years had always the blessings of the Vatican, but it vaccinated its believers with the idea: We have the true God, and the Jews have crucified Him. The Church sowed hate instead of love, though the Ten Commandments state: Thou shalt not kill." And then on p. 64 http://books.google.com/books?id=QXCyjj6T5ZUC&lpg=PP1&pg=PA64#v=onepage&q&f=false: "I'm not a Communist but I can well understand why they destroyed the Church in Russia. All the wrongs come home, as the proverb says. The Church will pay for its dealings with Hitler, and Germany, too." And on p. 65 http://books.google.com/books?id=QXCyjj6T5ZUC&lpg=PP1&pg=PA65#v=onepage&q&f=false: "I don't like to implant in youth the Church's doctrine of a personal God, because that Church has behaved so inhumanely in the past 2000 years. The fear of punishment makes the people march. Consider the hate the Church manifested against the Jews and then against the Muslims, the Crusades with their crimes, the burning stakes of the Inquisition, the tacit consent of Hitler's actions while the Jews and the Poles dug their own graves and were slaughtered. And Hitler is said to have been an alter boy! The truly religious man has no fear of life and no fear of death—and certainly no blind faith; his faith must be in his conscience. . . . I am therefore against all organized religion. Too often in history, men have followed the cry of battle rather than the cry of truth." When Hermanns asked him "Isn't it only human to move along the line of least resistance?", Einstein responded "Yes. It is indeed human, as proved by Cardinal Pacelli, who was behind the Concordat with Hitler. Since when can one make a pact with Christ and Satan at the same time? And he is now the Pope! The moment I hear the word 'religion', my hair stands on end. The Church has always sold itself to those in power, and agreed to any bargain in return for immunity. It would have been fine if the spirit of religion had guided the Church; instead, the Church determined the spirit of religion. Churchmen through the ages have fought political and institutional corruption very little, so long as their own sanctity and church property were preserved."
Misattributed

“It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.”

"On the Method of Theoretical Physics" The Herbert Spencer Lecture, delivered at Oxford (10 June 1933); also published in Philosophy of Science, Vol. 1, No. 2 (April 1934), pp. 163-169., p. 165. [thanks to Dr. Techie @ www.wordorigins.org and JSTOR]
There is a quote attributed to Einstein that may have arisen as a paraphrase of the above quote, commonly given as “Everything should be made as simple as possible, but no simpler,” "Everything should be made as simple as possible, but not simpler", or “Make things as simple as possible, but not simpler.” See this article from the Quote Investigator http://quoteinvestigator.com/2011/05/13/einstein-simple/ for a discussion of where these later variants may have arisen.
The original quote is very similar to Occam's razor, which advocates that among all hypotheses compatible with all available observations, the simplest hypothesis is the most plausible one.
The aphorism "everything should be made as simple as possible, but no simpler" is normally taken to be a warning against too much simplicity and emphasizes that one cannot simplify things to a point where the hypothesis is no more compatible with all observations. The aphorism does not contradict or extend Occam's razor, but rather stresses that both elements of the razor, simplicity and compatibility with the observations, are essential.
The earliest known appearance of Einstein's razor is an essay by Roger Sessions in the New York Times (8 January 1950) http://select.nytimes.com/gst/abstract.html?res=F30615FE3559137A93CAA9178AD85F448585F9, where Sessions appears to be paraphrasing Einstein: “I also remember a remark of Albert Einstein, which certainly applies to music. He said, in effect, that everything should be as simple as it can be, but not simpler.”
Another early appearance, from Time magazine (14 December 1962) http://www.time.com/time/magazine/article/0,9171,872923,00.html: “We try to keep in mind a saying attributed to Einstein—that everything must be made as simple as possible, but not one bit simpler.”
1930s

“I speak to everyone in the same way, whether he is the garbage man or the president of the university.”

Attributed to Einstein by his colleague Léopold Infeld in his book Quest: An Autobiography (1949), p. 291 http://books.google.com/books?id=fsvXYpOSowkC&q=%22garbage+man%22#v=snippet&q=%22garbage%20man%22&f=false
Attributed in posthumous publications

“The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it.”

Variant: The world is dangerous, not because of those who do evil, but because of those who look on and do nothing.

Albert Einstein quote: “Genius is 1% talent and 99% percent hard work…”

“It is the only physical theory of universal content concerning which I am convinced that, within the framework of the applicability of its basic concepts, it will never be overthrown”

1940s, "Autobiographical Notes" (1949)
Context: A theory is the more impressive the greater the simplicity of its premises is, the more different kinds of things it relates, and the more extended is its area of applicability. Therefore the deep impression which classical thermodynamics made upon me. It is the only physical theory of universal content concerning which I am convinced that, within the framework of the applicability of its basic concepts, it will never be overthrown (for the special attention of those who are skeptics on principle).

“When I examine myself and my methods of thought I come to the conclusion that the gift of fantasy has meant more to me than my talent for absorbing positive knowledge.”

A comment recalled by János Plesch in János, the Story of a Doctor (1947), p. 207. Also quoted in Einstein: the Life and Times by Ronald W. Clark (1971), p. 118 http://books.google.com/books?id=6IKVA0lY6MAC&lpg=PP1&pg=PA118#v=onepage&q&f=false.
1940s
Variant: "When I examine myself and my methods of thought, I come close to the conclusion that the gift of imagination has meant more to me than my talent for absorbing absolute knowledge." From The Ultimate Quotable Einstein by Alice Calaprice (2010), p. 26 http://books.google.com/books?id=G_iziBAPXtEC&lpg=PP1&pg=PA26#v=onepage&q&f=false. This book attributes it to Einstein and the Humanities (1979) by Dennis Ryan, p. 125, but Calaprice seems to have copied it wrong, since searching "inside the book" on this book's amazon page http://www.amazon.com/Einstein-Humanities-Contributions-Dennis-Ryan/dp/0313253803 using the word "gift" shows that p. 125 actually gives the same quote as in János, the Story of a Doctor.

“The most important human endeavor is the striving for morality in our actions. Our inner balance and even our very existence depend on it. Only morality in our actions can give beauty and dignity to life.”

Letter to the minister of a church in Brooklyn (20 November 1950), p. 95. The minister had earlier written Einstein asking if he would send him a signed version of a quote about the Catholic church attributed to Einstein in Time magazine (see the "Misattributed" section below), and Einstein had written back to say the quote was not correct, but that he was "gladly willing to write something else which would suit your purpose". According to the book, the minister replied "saying he was glad the statement had not been correct since he too had reservations about the historical role of the Church at large", and said that "he would leave the decision to Einstein as to the topic of the statement", to which Einstein replied with the statement above.
Attributed in posthumous publications, Albert Einstein: The Human Side (1979)
Context: The most important human endeavor is the striving for morality in our actions. Our inner balance and even our very existence depend on it. Only morality in our actions can give beauty and dignity to life. To make this a living force and bring it to clear consciousness is perhaps the foremost task of education. The foundation of morality should not be made dependent on myth nor tied to any authority lest doubt about the myth or about the legitimacy of the authority imperil the foundation of sound judgment and action.

“Setting an example is not the main means of influencing others, it is the only means.”

The original: "Example is not the main thing. It is the only thing. That is, if the one giving the example is not saying to himself, 'Behold I am giving an example." That spoils it. Anyone thinking of the example he will give to others has lost his simplicity. Only as a man has simplicity can his example influence others" is a quote by Albert Schweitzer, from a 1952 interview in United Nations World magazine https://books.google.com/books?id=qTAoAAAAMAAJ&q=%22example+is+not+the+main+thing%22&dq=%22example+is+not+the+main+thing%22&hl=en&sa=X&ved=0ahUKEwjz7f_2v6vMAhUJxmMKHeEAB-QQ6AEIHDAA. Not attributed to Einstein until the 1990s https://books.google.com/books?id=JdRZAAAAYAAJ&q=%22example+is+not+the+main+thing%22+einstein&dq=%22example+is+not+the+main+thing%22+einstein&hl=en&sa=X&ved=0ahUKEwif56qcwqvMAhXGMGMKHST5DRIQ6AEIHTAA.
Misattributed

“No one can read the Gospels without feeling the actual presence of Jesus. His personality pulsates in every word. No myth is filled with such life.”

As reported in Einstein — A Life (1996) by Denis Brian, when asked about a clipping from a magazine article reporting his comments on Christianity as taken down by Viereck, Einstein carefully read the clipping and replied, "That is what I believe." .
1920s, Viereck interview (1929)

“I see a clock, but I cannot envision the clockmaker. The human mind is unable to conceive of the four dimensions, so how can it conceive of a God, before whom a thousand years and a thousand dimensions are as one?”

From Cosmic Religion: with Other Opinions and Aphorisms (1931), Albert Einstein, pub. Covici-Friede. Quoted in The Expanded Quotable Einstein, Princeton University Press; 2nd edition (May 30, 2000); Page 208, ISBN 0691070210
1930s

“Coincidence is God's way of remaining anonymous.”

The source generally (but falsely) cited is Einstein's The World As I See It http://en.wikipedia.org/wiki/The_World_as_I_See_It_(book) (1949). The quotation is probably a translation of "Der Zufall ist das Pseudonym, das der liebe Gott wählt, wenn er inkognito bleiben will" (attributed to Albert Schweitzer).
Disputed

“You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat.”

Earliest published version found on Google Books with this phrasing is in the 1993 book The Internet Companion: A Beginner's Guide to Global Networking by Tracy L. LaQuey and Jeanne C. Ryer, p. 25 http://books.google.com/books?id=sP5SAAAAMAAJ&q=meowing#search_anchor. However, the quote seems to have been circulating on the internet earlier than this, appearing for example in this post from 1987 http://groups.google.com/group/comp.lang.c/msg/cc89abb5e065d23f?hl=en and this one from 1985 http://groups.google.com/group/net.sources.games/browse_thread/thread/846af15b5a38c35/3d6d5a639c24bba3. No reference has been found that cites a source in Einstein's original writings, and the quote appears to be a variation of an old joke that dates at least as far back as 1866, as discussed in this entry from the "Quote Investigator" blog http://quoteinvestigator.com/2012/02/24/telegraph-cat/#more-3387. A variant was told by Thomas Edison, appearing in The Diary and Sundry Observations of Thomas Alva Edison (1948), p. 216 http://books.google.com/books?id=NXtEAAAAIAAJ&q=edinburgh#search_anchor: "When I was a little boy, persistently trying to find out how the telegraph worked and why, the best explanation I ever got was from an old Scotch line repairer who said that if you had a dog like a dachshund long enough to reach from Edinburgh to London, if you pulled his tail in Edinburgh he would bark in London. I could understand that. But it was hard to get at what it was that went through the dog or over the wire." A variant of Edison's comment can be found in the 1910 book Edison, His Life and Inventions, Volume 1 by Frank Lewis Dyer and Thomas Commerford Martin, p. 53 http://books.google.com/books?id=qN83AAAAMAAJ&pg=PA53#v=onepage&q&f=false.
The wireless telegraph is not difficult to understand. The ordinary telegraph is like a very long cat. You pull the tail in New York, and it meows in Los Angles. The wireless is the same, only without the cat.
Variant, earliest known published version is How to Think Like Einstein by Scott Thorpe (2000), p. 61 http://books.google.com/books?id=9yrYQxBgIYEC&lpg=PP1&pg=PA61#v=onepage&q&f=false. Appeared on the internet before that, as in this archived page from 12 October 1999 http://web.archive.org/web/19991012152820/http://stripe.colorado.edu/%7Ejudy/einstein/advice.html
Misattributed

“A new type of thinking is essential if mankind is to survive and move toward higher levels.”

From "Atomic Education Urged by Einstein" https://web.archive.org/web/20140622171150/http://www.turnthetide.info/id54.htm, New York Times (25 May 1946), and later quoted in the article "The Real Problem is in the Hearts of Man" by Michael Amrine, from the New York Times Magazine (23 June 1946). A slightly modified version of the 23 June article was reprinted in Einstein on Peace by Otto Nathan and Heinz Norden (1960), and it was also reprinted in Einstein on Politics by David E. Rowe and Robert Schulmann (2007), p. 383.
In The New Quotable Einstein (2005), editor Alice Calaprice suggests that two quotes attributed to Einstein which she could not find sources for, "The significant problems we face cannot be solved at the same level of thinking we were at when we created them" and "The world we have created today as a result of our thinking thus far has problems which cannot be solved by thinking the way we thought when we created them," may both be paraphrases of the 1946 quote above. A similar unsourced variant is "The world we have created is a product of our thinking; it cannot be changed without changing our thinking."
In the 23 June article Einstein expanded somewhat on the original quote from the 25 May article:
: Many persons have inquired concerning a recent message of mine that "a new type of thinking is essential if mankind is to survive and move to higher levels."
: Often in evolutionary processes a species must adapt to new conditions in order to survive. Today the atomic bomb has altered profoundly the nature of the world as we knew it, and the human race consequently finds itself in a new habitat to which it must adapt its thinking.
: In the light of new knowledge, a world authority and an eventual world state are not just desirable in the name of brotherhood, they are necessary for survival. In previous ages a nation's life and culture could be protected to some extent by the growth of armies in national competition. Today we must abandon competition and secure cooperation. This must be the central fact in all our considerations of international affairs; otherwise we face certain disaster. Past thinking and methods did not prevent world wars. Future thinking must prevent wars.
1940s

“The definition of insanity is doing the same thing over and over and expecting different results.”

Variously attributed also to Benjamin Franklin and Mark Twain. The earliest known occurrence, and probable origin, is from a 1981 text from Narcotics Anonymous: "Insanity is repeating the same mistakes and expecting different results." Cf. Rita Mae Brown#Misattributed.
Misattributed
Variant: Insanity: doing the same thing over and over again and expecting different results.

“If you can't explain it to a six year old, you don't understand it yourself.”

Variant: If you can't explain it to a six year old, you don't understand it yourself.

“Logic will get you from A to Z; imagination will get you everywhere.”

Variant: Logic will get you from A to B. Imagination will take you anywhere.

“Great spirits have always encountered violent opposition from mediocre minds.”

Variant: Great ideas often receive violent opposition from mediocre minds.

“It is not that I'm so smart. But I stay with the questions much longer.”

Variant: It's not that I'm so smart, it's just that I stay with problems longer.

“Everything must be made as simple as possible. But not simpler.”

Variant: Everything should be made as simple as possible, but no simpler.

Albert Einstein quote: “Whoever is careless with the truth in small matters cannot be trusted with important matters.”

“Whoever is careless with the truth in small matters cannot be trusted with important matters.”

1950s
Context: In matters concerning truth and justice there can be no distinction between big problems and small; for the general principles which determine the conduct of men are indivisible. Whoever is careless with truth in small matters cannot be trusted in important affairs.

(1955) as quoted in Albert Einstein: Historical and Cultural Perspectives (1997) ed. , p. 388, from The Centennial Symposium in Jerusalem (1979)

Albert Einstein quote: “The important thing is not to stop questioning.”

“The important thing is not to stop questioning.”

Old Man's Advice to Youth: "Never Lose a Holy Curiosity," http://books.google.com/books?id=dlYEAAAAMBAJ&lpg=PP1&dq=Life%2C%202%20May%201955&pg=PA61#v=onepage&q=Life,%202%20May%201955&f=false LIFE magazine (2 May 1955) statement to William Miller, p. 64.
1950s
Context: The important thing is not to stop questioning. Curiosity has its own reason for existence. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery each day. Never lose a holy curiosity. … Don't stop to marvel.

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