“The struggle for power is universal in time and space and is an undeniable fact of experience.”

Source: "Quotes", Fearful Symmetry : A Study of William Blake (1947), p. 46

The Philosophy of Space and Time (1928, tr. 1957)

The Mind (begun in September 1723; not completed).

Source: War in Heaven (1998), p. 537

Source: The Untethered Soul: The Journey Beyond Yourself

As quoted in the Associated Press obituary (27 April 1988)
Context: I have tried at times to place humans in perspective against the vastness of universal time and space. I have been concerned with where we, as a race, may be going and what may be our purpose in the universal scheme — if we have a purpose. In general, I believe we do, and perhaps an important one.

Session 919, Page 373
Dreams, Evolution and Value Fulfillment, Volume Two (1986)

Conclusion
The Ethics of Ambiguity (1947)
Context: In Plato, art is mystification because there is the heaven of Ideas; but in the earthly domain all glorification of the earth is true as soon as it is realized. Let men attach value to words, forms, colors, mathematical theorems, physical laws, and athletic prowess; let them accord value to one another in love and friendship, and the objects, the events, and the men immediately have this value; they have it absolutely. It is possible that a man may refuse to love anything on earth; he will prove this refusal and he will carry it out by suicide. If he lives, the reason is that, whatever he may say, there still remains in him some attachment to existence; his life will be commensurate with this attachment; it will justify itself to the extent that it genuinely justifies the world.
This justification, though open upon the entire universe through time and space, will always be finite. Whatever one may do, one never realizes anything but a limited work, like existence itself which tries to establish itself through that work and which death also limits. It is the assertion of our finiteness which doubtless gives the doctrine which we have just evoked its austerity and, in some eyes, its sadness. As soon as one considers a system abstractly and theoretically, one puts himself, in effect, on the plane of the universal, thus, of the infinite. … existentialism does not offer to the reader the consolations of an abstract evasion: existentialism proposes no evasion. On the contrary, its ethics is experienced in the truth of life, and it then appears as the only proposition of salvation which one can address to men. Taking on its own account Descartes’ revolt against the evil genius, the pride of the thinking reed in the face of the universe which crushes him, it asserts that, despite his limits, through them, it is up to each one to fulfill his existence as an absolute. Regardless of the staggering dimensions of the world about us, the density of our ignorance, the risks of catastrophes to come, and our individual weakness within the immense collectivity, the fact remains that we are absolutely free today if we choose to will our existence in its finiteness, a finiteness which is open on the infinite. And in fact, any man who has known real loves, real revolts, real desires, and real will knows quite well that he has no need of any outside guarantee to be sure of his goals; their certitude comes from his own drive. There is a very old saying which goes: “Do what you must, come what may.” That amounts to saying in a different way that the result is not external to the good will which fulfills itself in aiming at it. If it came to be that each man did what he must, existence would be saved in each one without there being any need of dreaming of a paradise where all would be reconciled in death.

Letter of 1950, as quoted in The New York Times (29 March 1972) and The New York Post (28 November 1972). However, The New Quotable Einstein by Alice Calaprice (Princeton University Press, 2005: , p. 206, has a different and presumably more accurate version of this letter, which she dates to February 12, 1950 and describes as "a letter to a distraught father who had lost his young son and had asked Einstein for some comforting words":<blockquote>A human being is a part of the whole, called by us "Universe," a part limited in time and space. He experiences himself, his thoughts and feelings as something separate from the rest—a kind of optical delusion of his consciousness. The striving to free oneself from this delusion is the one issue of true religion. Not to nourish it but to try to overcome it is the way to reach the attainable measure of peace of mind.</blockquote> Letter transcript and photograph http://www.lettersofnote.com/2011/11/delusion.html
Google Translate, with its improved neural machine translation system, gives a slightly different translation of the original German quote, as discussed by Bryce Haymond on his blog https://thymindoman.com/2018/03/29/einsteins-misquote-on-the-illusion-of-feeling-separate-from-the-whole/.<blockquote>A human being is a spatially and temporally limited piece of the whole, what we call the “Universe.” He experiences himself and his feelings as separate from the rest, an optical illusion of his consciousness. The quest for liberation from this bondage is the only object of true religion. Not nurturing the illusion but only overcoming it gives us the attainable measure of inner peace.</blockquote>
1950s
Context: A human being is a part of the whole, called by us "Universe", a part limited in time and space. He experiences himself, his thoughts and feelings as something separated from the rest — a kind of optical delusion of his consciousness. This delusion is a kind of prison for us, restricting us to our personal desires and to affection for a few persons nearest to us. Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty. Nobody is able to achieve this completely, but the striving for such achievement is in itself a part of the liberation and a foundation for inner security.