“It is only the darkness in our own hearts that will defeat us, in the end.”

Thoughts and Aphorisms (1913), Karma
Context: If thou think defeat is the end of thee, then go not forth to fight, even though thou be the stronger. For Fate is not purchased by any man nor is Power bound over to her possessors. But defeat is not the end, it is only a gate or a beginning.

Speech to the Cabinet (28 May 1940), quoted in Martin Gilbert, Finest Hour: Winston S. Churchill, 1939–1941 (London: Heinemann, 1983), p. 420
The Second World War (1939–1945)
Context: I have thought carefully in these last days whether it was part of my duty to consider entering negotiations with That Man. But it was idle to think that, if we tried to make peace now, we should get better terms than if we fought it out. The Germans would demand our fleet—that would be called 'disarmament'—our naval bases, and much else. We should become a slave state, though a British Government which would be Hitler's puppet would be set up—under Mosley or some such person. And where should we be at the end of all that? On the other hand, we had immense reserves and advantages. And I am convinced that every man of you would rise up and tear me from my place if I were for one moment to contemplate parley or surrender. If this long island story of ours is to end at last, let it end only when each one of us lies choking in his own blood upon the ground.

Source: Battlefield of the Mind: Winning the Battle in Your Mind

Source: Earthsea Books, A Wizard of Earthsea (1968), Chapter 7 (Ged)

Speech, Cleveland City Council (13 October 2003) http://www.gwu.edu/~action/2004/kucinich/kucin101303.html.

Cross-correspondences (p. 69-70)
The Immortalization Commission: The Strange Quest to Cheat Death (2011)

Presidential address to the AFPFL Supreme Council Session (August 1946)