"Force and mind are opposites." This quote is derived from John Galt's speech in Ayn Rand's Atlas Shrugged.
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Source: "So long as men desire to live together, no man may initiate—do you hear me? no man may start—the use of physical force against others. . . . Force and mind are opposites; morality ends where a gun begins." from Galt's speech, Atlas Shrugged