"It is a law of our humanity, that man must know both good and evil; he must know good through evil. There never was a principle but what triumphed through much evil; no man ever progressed to greatness and goodness but through great mistakes."

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Our strength lies in spiritual concepts. It lies in public sensitivities to evil. Our greatest danger is not from invading armies. Our dangers are that we may commit suicide from within by complaisance with evil, or by public tolerance of scandalous behavior.

— Herbert Hoover