“Never think of pain or danger or enemies a moment longer than is necessary to fight them.”
Source: Atlas Shrugged
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Ayn Rand 322
Russian-American novelist and philosopher 1905–1982Related quotes

PJTV: How Breitbart Conquered ACORN (and the MSM) https://www.youtube.com/watch?v=tKgjCDe0BSc (27 September 2009)
2000s

Speech to 1922 Committee (19 July 1984) http://www.margaretthatcher.org/document/105563, quoted in John Campbell, Margaret Thatcher. The Iron Lady (London: Jonathan Cape, 2003), p. 361.
Second term as Prime Minister

"How to fight software patents - singly and together", Newsforge (9 September 2004)
2000s

“Convictions are more dangerous enemies of truth than lies.”
Section IX, "Man Alone with Himself" / aphorism 483
Human, All Too Human (1878), Helen Zimmern translation
Context: Enemies of truth. Convictions are more dangerous enemies of truth than lies.

“An enemy forgiven is more dangerous than a thousand foes.”
Quoted in "The Suez Canal in World Affairs" - Page 79 - by Hugh Joseph Schonfield - 1952

“Stupidity is a more dangerous enemy of the good than malice.”
The Bonhoeffer Reader https://www.google.com/books/edition/The_Bonhoeffer_Reader/CNZgAwAAQBAJ?hl=en&gbpv=1&pg=PA766, p. 766
Letters and Papers from Prison (1967; 1997), On Stupidity