“The fact is that in order to do any thing in this world worth doing, we must not stand shivering on the bank thinking of the cold and the danger, but jump in and scramble through as well as we can.”
Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 6
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Sydney Smith 68
English writer and clergyman 1771–1845Related quotes

Willie's Question
The Disciple and Other Poems (1867)

“We must not think of the things we could do with, but only of the things that we can't do without.”
Source: Three Men in a Boat

Speech http://hansard.millbanksystems.com/commons/1935/mar/11/defence in the House of Commons (11 March 1935). Attlee's concluding observation was met by Conservative cries of "Hear, hear", with one MP shouting "Tell that to Hitler" according to The Times of 12 March 1935.
1930s

Michael Franti Interview http://www.youtube.com/watch?v=5s75CPceiCw&feature=related

2009, A New Beginning (June 2009)
“Anything worth doing is worth doing poorly--until you can learn to do it well.”

In Search of a Better World (1984)
Context: There are uncertain truths — even true statements that we may take to be false — but there are no uncertain certainties.
Since we can never know anything for sure, it is simply not worth searching for certainty; but it is well worth searching for truth; and we do this chiefly by searching for mistakes, so that we have to correct them.
Source: Introduction to the Study of Public Administration, 1926, p. 243-244