“He reminds me of that excitement when De Niro and I stumbled upon a way of working together - a similar kind of energy to the actors in the 1970s. It’s very rare for me to find that kind of connection again. Leo will give me the emotion where I least expect it and could only hope for it about three or four scenes. And he can do it take after take.”

Letter to George Whitefield (19 June 1764), published in The Works of Benjamin Franklin (1856).
Epistles

Get Him Back
Song lyrics, Extraordinary Machine (2005)

Quote from 'Lecture on Nothing', (c. 1949), in 'Silence: lectures and writings by John Cage; Publisher Middletown, Conn. Wesleyan University Press, June 1961, p. 127
this lecture had been prepared some years earlier, but was not printed until 1959, when it appeared in 'It Is', ed. Philip Pavia
1950s

This, and variants of it, have been been widely circulated as a Quaker saying since at least 1869, and attributed to Grellet since at least 1893. W. Gurney Benham in Benham's Book of Quotations, Proverbs, and Household Words (1907) states that though sometimes attributed to others, "there seems to be some authority in favor of Stephen Grellet being the author, but the passage does not appear in any of his printed works." It appears to have been published as an anonymous proverb at least as early as 1859, when it appeared in Household Words : A Weekly Journal.
It has also often become attributed to the more famous Quaker William Penn, as well as others including Mahatma Gandhi and Ralph Waldo Emerson.
Variants:
I expect to pass through this world but once. If, therefore, there be any kindness I can show, or any good thing I can do any fellow human being let me do it now. Let me not defer or neglect it, for I will not pass this way again.
Writing of an unnamed Quaker, as quoted in Scott's Monthly Magazine Vol. VII, No. 6 (June 1869, p. 475, edited by William J. Scott
I expect to pass through this world but once. Any good thing, therefore, that I can do or any kindness I can show to any fellow human being let me do it now. Let me not defer nor neglect it, for I shall not pass this way again.
As quoted anonymously in Hour by Hour; or, The Christian's Daily Life (1885), compiled by E.A.L., p. 37, and as "the old Quaker's words" in The Unitarian Vol. VI (July 1891); this version was given the title "Do It Now" in Heart Throbs: In Prose and Verse (1905) by Joe Mitchell Chapple.
I shall pass through this world but once! Any good thing, therefore, that I can do or any kindness that I can show to any human being, let me do it now, in his name, and for his sake! Let me not defer or neglect it, for I shall not pass this way again.
Anonymous quotation on a card, as quoted in The Friend, Vol. 61 (1888) by The Society of Friends, p. 364
I shall pass through this world but once. Any good, therefore, that I can do or any kindness I can show to any human being, let me do it now. Let me not defer or neglect it, for I shall not pass this way again.
Anonymous quotation on a card, as quoted in A Memorial of a True Life : A Biography of Hugh McAllister Beaver (1898) by Robert Elliott Speer, p. 169
I expect to pass through this world but once. If, therefore, there be any kindness I can show, or any good thing I can do, to any fellow being let me do it now. Let me not defer nor neglect it, for I shall not pass this way again.
As quoted anonymously in The Lamp Vol. XXVI (February-July 1903)
Disputed

This quote is often attributed to William Penn, but there are no records of it before the 19th century, and its actual source seems to have most likely been another prominent Quaker, Stephen Grellet.
Misattributed

Comments on Fear and Loathing in Las Vegas in The Great Shark Hunt: Strange Tales from a Strange Time (1979), p. 109
1970s
Context: The only other important thing to be said about Fear & Loathing at this time is that it was fun to write, and that's rare — for me, at least, because I've always considered writing the most hateful kind of work. I suspect it's a bit like fucking — which is fun only for amateurs. Old whores don't do much giggling. Nothing is fun when you have to do it — over and over, again and again — or else you'll be evicted, and that gets old. So it's a rare goddamn trip for a locked-in, rent-paying writer to get into a gig that, even in retrospect, was a kinghell, highlife fuck-all from start to finish... and then to actually get paid for writing this kind of manic gibberish seems genuinely weird; like getting paid for kicking Agnew in the balls. So maybe there's hope. Or maybe I'm going mad... In a nation ruled by swine, all pigs are upward mobile — and the rest of us are fucked until we can put our acts together: Not necessarily to Win, but mainly to keep from Losing Completely... The Swine are gearing down for a serious workout this time around... So much, then, for The Road — and for the last possibilities of running amok in Las Vegas... Well, at least, I'll know I was there, neck deep in the madness, before the deal went down, and I got so high and wild that I felt like a two-ton Manta ray jumping all the way across the Bay of Bengal.

Interview with Ekyse Knox http://www.westernclippings.com/interview/elyseknox_interview.shtml

Source: Wuthering Heights

[Fahner, Molly, Fun Fearless Female of the Year: Ali Larter, Cosmopolitan, 2007, http://www.cosmopolitan.com/celebrity/exclusive/ali-larter-cover-interview, 2010-06-27]