"My own survival required me to counterbalance interesting with invisible."

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Man's mind is his basic tool of survival. Life is given to him, survival is not. His body is given to him, its sustenance is not. His mind is given to him, its content is not. To remain alive, he must act, and before he can act he must know the nature and purpose of his action...To remain alive, he must think.

— John Galt