The greatest productive force is human selfishness. – Robert A. Heinlein
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Selfishness
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How a sickness enlarges the dimensions of a mans self to himself! He is his own exclusive object. Supreme selfishness is inculcated in him as his only duty, – Charles Lamb
If we should deal out justice only, in this world, who would escape? No, it is better to be generous, and in the end more profitable, for it gains gratitude for us, and love. – Mark Twain