A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity.

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More from Robert Heinlein

Money is a powerful aphrodisiac. But flowers work almost as well.

Never try to out stubborn a cat.

A brute kills for pleasure. A fool kills from hate.

Tilting at windmills hurts you more than the windmills.

Delusions are often functional. A mother’s opinions about her children’s beauty, intelligence, goodness, et cetera ad nauseum, keep her from drowning them at birth.