“If we do not do the impossible, we shall be faced with the unthinkable.”
Page 107 of the 2005 reprint.
The Ecology of Freedom (1982)
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Murray Bookchin 24
American libertarian socialist author, orator, and philosop… 1921–2006Related quotes

“What shall we do, what shall we do with all this useless beauty?”
All This Useless Beauty
Song lyrics, All This Useless Beauty (1996)
“We shall be judged by what we do, not by how we felt while we were doing it.”
Review of Altona, by Jean-Paul Sartre (1961), p. 97
Tynan Right and Left (1967)

As quoted in The Historical Development of Quantum Theory: Its Foundation and the Rise of Its Difficulties, 1900-1925 (2001) by Jagdish Mehra, p. 437.
Attributed

“What shall we do
after we learn what we'll do:
that is the question.”
Poems, Shadow of Time (2005)

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
“No matter how impossible this war, I shall fight to win. Whatever I have to do, I will do.”
Source: Drenai series, The King Beyond the Gate, Ch. 8

“We are too young to realize that certain things are impossible… So we will do them anyway.”

“We have finished the job. What shall we do with the tools?”
Telegram to Winston Churchill after reclaiming Ethiopia from Italian forces (1941), as quoted in Ambrosia and Small Beer (1964) by Edward Marsh. This makes a play on Churchill's 1941 statement to the U.S. "Give us the tools, and we will finish the job".