The answer comes from the realization that genes for behavior, as well as for malaria resistance and teeth, are subject to natural selection. Why Is Sex Fun?: The Evolution of Human Sexuality
Men of profound sadness betray themselves when they are happy: they have a way of embracing happiness as if they wanted to crush and suffocate it, from jealousy: alas, they know only too well that it will flee. Beyond Good and Evil
Money and goods are certainly the best of references. Our Mutual Friend
If we all got angry together something might be done. The Return of the King
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