Robert A. Heinlein Quotes on Motivation
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Beware of altruism. It is based on self-deception, the root of all evil.
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Never appeal to a man's 'better nature.' He may not have one. Invoking his self-interest gives you more leverage.
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Your enemy is never a villain in his own eyes. Keep this in mind; it may offer a way to make him your friend. If not, you can kill him without hate - and quickly.