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

There is no conclusive evidence of life after death. But there is no evidence of any sort against it. Soon enough you will know. So why fret about it?

Be wary of strong drink. It can make you shoot at tax collectors, and miss.

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.