The Rebel (1951) 
Context: One might think that a period which, in a space of fifty years, uproots, enslaves, or kills seventy million human beings should be condemned out of hand. But its culpability must still be understood... In more ingenuous times, when the tyrant razed cities for his own greater glory, when the slave chained to the conqueror's chariot was dragged through the rejoicing streets, when enemies were thrown to the wild beasts in front of the assembled people, the mind did not reel before such unabashed crimes, and the judgment remained unclouded. But slave camps under the flag of freedom, massacres justified by philanthropy or by a taste for the superhuman, in one sense cripple judgment. On the day when crime dons the apparel of innocence — through a curious transposition peculiar to our times — it is innocence that is called upon to justify itself.
                                    
“It had occurred to Rimford, at about the time he approached fifty, that the chief drawback in contemplating the enormous gulfs of time and space that constitute the bricks and mortar of the cosmologist is that one acquires a dismaying perception of the handful of years allotted a human being.”
Source: The Hercules Text (1986), Chapter 3 (p. 37)
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Jack McDevitt 125
American novelist, Short story writer 1935Related quotes
Lee Kuan Yew, in an interview with Channel NewsAsia in 2005. http://viweb.freehosting.net/SRajaratnam.htm
“A human being is a part of the whole, called by us "Universe", a part limited in time and space.”
                                        
                                        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.
                                    
Quoted in Michael Short, Gustav Holst 1874-1934: A Centenary Documentation
                                        
                                        Session 919, Page 373 
Dreams, Evolution and Value Fulfillment, Volume Two (1986)