“Everything which is demanded is by that fact a good.”
"The Will to Believe" p. 205 http://books.google.com/books?id=Moqh7ktHaJEC&pg=PA205 <br class="br">1890s, The Will to Believe and Other Essays in Popular Philosophy (1897)
William James was an American philosopher and psychologist who was also trained as a physician. The first educator to offer a psychology course in the United States, James was one of the leading thinkers of the late nineteenth century and is believed by many to be one of the most influential philosophers the United States has ever produced, while others have labeled him the "Father of American psychology".
Along with Charles Sanders Peirce and John Dewey, James is considered to be one of the major figures associated with the philosophical school known as pragmatism, and is also cited as one of the founders of functional psychology. A Review of General Psychology analysis, published in 2002, ranked James as the 14th most eminent psychologist of the 20th century. He also developed the philosophical perspective known as radical empiricism. James' work has influenced intellectuals such as Émile Durkheim, W. E. B. Du Bois, Edmund Husserl, Bertrand Russell, Ludwig Wittgenstein, Hilary Putnam, and Richard Rorty, and has even influenced Presidents, such as Jimmy Carter.
Born into a wealthy family, James was the son of the Swedenborgian theologian Henry James Sr. and the brother of both the prominent novelist Henry James, and the diarist Alice James. James wrote widely on many topics, including epistemology, education, metaphysics, psychology, religion, and mysticism. Among his most influential books are The Principles of Psychology, which was a groundbreaking text in the field of psychology, Essays in Radical Empiricism, an important text in philosophy, and The Varieties of Religious Experience, which investigated different forms of religious experience, which also included the then theories on mind-cure.

“Everything which is demanded is by that fact a good.”
"The Will to Believe" p. 205 http://books.google.com/books?id=Moqh7ktHaJEC&pg=PA205 <br class="br">1890s, The Will to Believe and Other Essays in Popular Philosophy (1897)
Lectures VI and VII, "The Sick Soul"
1900s, The Varieties of Religious Experience (1902)
“A thing is important if anyone think it important.”
Source: 1890s, The Principles of Psychology (1890), Ch. 28, Note 35
Lecture III, "The Reality of the Unseen"
1900s, The Varieties of Religious Experience (1902)
Lectures IV and V, "The Religion of Healthy-Mindedness"
1900s, The Varieties of Religious Experience (1902)
Lectures XIV and XV, "The Value of Saintliness"
1900s, The Varieties of Religious Experience (1902)
“I wished, by treating Psychology like a natural science, to help her to become one.”
A Plea for Psychology as a Natural Science (1892)
1920s, Collected Essays and Reviews (1920)
Source: 1890s, The Principles of Psychology (1890), Ch. 4
“Inferiority is always with us, and merciless scorn of it is the keynote of the military temper.”
1900s, The Moral Equivalent of War (1906)
“The impulse to take life strivingly is indestructible in the race.”
Source: 1890s, The Principles of Psychology (1890), Ch. 21
"The Acquisition of Ideas"
1910s, Talks to Teachers on Psychology and to Students on Some of Life's Ideals (1911)
Lecture IX, "Conversion, concluded"
1900s, The Varieties of Religious Experience (1902)
Lecture I, "Religion and Neurology"
1900s, The Varieties of Religious Experience (1902)
The Dilemma of Determinism in "The Will to Believe" p. 151 http://books.google.com/books?id=Moqh7ktHaJEC&pg=PA151 <br class="br">1890s, The Will to Believe and Other Essays in Popular Philosophy (1897)
Lecture II, "Circumscription of the Topic"
1900s, The Varieties of Religious Experience (1902)
Lecture I, The Present Dilemma in Philosophy
1900s, Pragmatism: A New Name for Some Old Ways of Thinking (1907)
Lecture II, What Pragmatism Means
1900s, Pragmatism: A New Name for Some Old Ways of Thinking (1907)
"The Will to Believe" p. 14 http://books.google.com/books?id=Moqh7ktHaJEC&pg=PA14 <br class="br">1890s, The Will to Believe and Other Essays in Popular Philosophy (1897)
William James Is Life Worth Living?
"Is Life Worth Living?"
1890s, The Will to Believe and Other Essays in Popular Philosophy (1897)
Lectures XIV and XV, "The Value of Saintliness"
1900s, The Varieties of Religious Experience (1902)
The Dilemma of Determinism (1884) republished in The Will to Believe, Dover, 1956, p. 149
1880s
Lectures IV and V, "The Religion of Healthy-Mindedness"
1900s, The Varieties of Religious Experience (1902)
"What Makes a Life Significant?"
1910s, Talks to Teachers on Psychology and to Students on Some of Life's Ideals (1911)
Lecture XX, "Conclusions"
1900s, The Varieties of Religious Experience (1902)
Lecture IX, "Conversion"
1900s, The Varieties of Religious Experience (1902)
Lecture I, "Religion and Neurology"
1900s, The Varieties of Religious Experience (1902)
Robert Gould Shaw: Oration upon the Unveiling of the Shaw Monument http://www.holycross.edu/departments/english/sluria/wjspeech.htm (31 May 1897) <br class="br">1910s, Memories and Studies (1911)
Letter to Henry James (ca. 1890) as quoted by Robert D. Richardson, William James: In the Maelstrom of American Modernism (2007) p. 297. Also as quoted partially by Alfred North Whitehead, Science and the Modern World (1925) p. 2.
1890s
Chapter XI: Attention http://books.google.com/books?id=U6ETAAAAYAAJ&q=%22It+is+an+odd+circumstance+that+neither+the+old+nor+the+new+by+itself+is+interesting+the+absolutely+old+is+insipid+the+absolutely+new+makes+no+appeal+at+all+The+old+in+the+new+is+what+claims+the+attention+the+old+with+a+slightly+new+turn%22&pg=PA108#v=onepage <br class="br">1910s, Talks to Teachers on Psychology and to Students on Some of Life's Ideals (1911)
“There is no more miserable human being than one in whom nothing is habitual but indecision.”
Source: 1890s, The Principles of Psychology (1890), Ch. 4
“Every way of classifying a thing is but a way of handling it for some particular purpose.”
1880s, The Sentiment of Rationality (1882)
“There is no worse lie than a truth misunderstood by those who hear it.”
Lectures XIV and XV, "The Value of Saintliness"
1900s, The Varieties of Religious Experience (1902)
Lecture III, "The Reality of the Unseen"
1900s, The Varieties of Religious Experience (1902)
Robert Gould Shaw: Oration upon the Unveiling of the Shaw Monument
1910s, Memories and Studies (1911)
Source: 1890s, The Principles of Psychology (1890), Ch. 25
“My thinking is first and last and always for the sake of my doing.”
Sometimes paraphrased as "Thinking is for doing", perhaps originally by S.T. Fiske (1992)
Source: 1890s, The Principles of Psychology (1890), Ch. 22
“An act has no ethical quality whatever unless it be chosen out of several all equally possible.”
Source: 1890s, The Principles of Psychology (1890), Ch. 9
“Democracy is still upon its trial. The civic genius of our people is its only bulwark.”
Robert Gould Shaw: Oration upon the Unveiling of the Shaw Monument
1910s, Memories and Studies (1911)
Source: 1890s, The Principles of Psychology (1890), Ch. 5
To his young son from the Yosemite Valley on (28 August 1989)
1920s, The Letters of William James (1920)
Lectures XVI and XVII, "Mysticism"
1900s, The Varieties of Religious Experience (1902)
“A purely disembodied human emotion is a nonentity.”
Source: 1890s, The Principles of Psychology (1890), Ch. 25
"Confidences of a 'Psychical Researcher'" http://hcl.harvard.edu/libraries/houghton/exhibits/james/psychical/7_8.cfm, in The American Magazine, Vol. 68 (1909), p. 589 <br class="br">Often (mis)quoted as: "We are like islands in the sea; separate on the surface but connected in the deep", or: "Our lives are like islands in the sea, or like trees in the forest, which co-mingle their roots in the darkness underground." <br class="br">1900s
"The Importance of Individuals"
1890s, The Will to Believe and Other Essays in Popular Philosophy (1897)
“A paradise of inward tranquility seems to be faith's usual result.”
Lectures XI, XII, and XIII, "Saintliness"
1900s, The Varieties of Religious Experience (1902)
"Preface"
1910s, Talks to Teachers on Psychology and to Students on Some of Life's Ideals (1911)
“All our scientific and philosophic ideals are altars to unknown gods.”
Lecture at the Harvard Divinity School (13 March 1884); published in the The Unitarian Review and Religious Magazine as The Dilemma of Determinism http://books.google.com/books?id=38DVAAAAMAAJ&q=%22All+our+scientific+and+philosophic+ideals+are+altars+to+unknown+gods%22&pg=PA196#v=onepage (September 1884) <br class="br">1880s
“A difference which makes no difference is no difference at all.”
As quoted in William James: The Essential Writings (1971), edited by Bruce W. Wilshire, p. xiii
1900s