Knowing Yourself: The True in the False (1996)
“The enemy is always in the mind.”
Source: The Princess Bride
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William Goldman 89
American novelist, screenwriter and playwright 1931–2018Related quotes
The Story of Islamic Imperialism in India (1994)

Jasper Ridley, Tito: A Biography (Constable and Company Ltd., 1994), p. 323.
Other

“A weapon is a device for making your enemy change his mind.”
Source: Vorkosigan Saga, The Vor Game (1990)

“Concentrated power has always been the enemy of liberty.”
The New Republic (16 December 1981) ; as cited in War and Conflict Quotations https://en.wikiquote.org/wiki/Special:BookSources/1476611483, eds. Michael & Jean Thomsett, McFarland (1997), p. 105
1980s, First term of office (1981–1985)

“Our enemies have always made the same mistake.”
1960s, Inaugural address (1965)
Context: Our enemies have always made the same mistake. In my lifetime—in depression and in war—they have awaited our defeat. Each time, from the secret places of the American heart, came forth the faith they could not see or that they could not even imagine. It brought us victory. And it will again. For this is what America is all about. It is the uncrossed desert and the unclimbed ridge. It is the star that is not reached and the harvest sleeping in the unplowed ground. Is our world gone? We say "Farewell." Is a new world coming? We welcome it—and we will bend it to the hopes of man.