“I never did anything worth doing by accident, nor did any of my inventions come indirectly through accident, except the phonograph. No, when I have, fully decided that a result is worth getting, I go about it, and make trial after trial, until it comes.”
Quoted by Theodore Dreiser in A Photographic Talk with Edison http://books.google.com/books?id=ZrIYCWaZCjwC&q=%22I+never+did+anything+worth+doing+by+accident%22+%22nor+did+any+of+my+inventions+come+indirectly+through+accident+except+the+phonograph+No+when+I+have+fully+decided+that+a+result+is+worth+getting+I+go+about+it+and+make+trial+after+trial+until+it+comes%22&pg=PA118#v=onepage, Success magazine (February 1898).
1800s
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Thomas Edison 57
American inventor and businessman 1847–1931Related quotes

As quoted in "Farrakhan in Speech: 'My Time Is Up' " by Jeff Karoub http://abcnews.go.com/US/wireStory?id=2903211 ABC News (26 February 2007)

“Nothing ever comes to me, that is worth having, except as the result of hard work.”
Source: 1900s, Up From Slavery (1901), Chapter XII: Raising Money

Lung Ying-tai (2013) cited in " PTS row 'worst' int'l scandal: Lung http://www.chinapost.com.tw/taiwan/national/national-news/2013/05/23/379324/PTS-row.htm" on The China Post, 23 May 2013

The Superstition of Divorce (1920)
Context: I do not ask them to assume the worth of my creed or any creed; and I could wish they did not so often ask me to assume the worth of their worthless, poisonous plutocratic modern society. But if it could be shown, as I think it can, that a long historical view and a patient political experience can at last accumulate solid scientific evidence of the vital need of such a vow, then I can conceive no more tremendous tribute than this, to any faith, which made a flaming affirmation from the darkest beginnings, of what the latest enlightenment can only slowly discover in the end.

In 'Possibilities', Vol. 1, no 1, winter 1947-48, p. 79; as quoted in Jackson Pollock (1983) by Elizabeth Frank, p. 68
1940's

as quoted by K.C. Cole, "A Theory of Everything" New York Times Magazine (1987) Oct.18
Cconversation with W.C. Seitz, in Abstract Expressionist Painting in America, W.C, Seitz, Cambridge Massachusetts, 1983, p. 94
after 1970

which I can hardly spare right now
February 8, 2005 http://web.archive.org/web/20050209/www.nationalreview.com/goldberg/goldberg200502081153.asp
2000s, 2005