A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity.
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Other Robert A. Heinlein quotes:
Once a man gets a reputation as a liar, he might as well be struck dumb, for people do not listen to the wind.
Never underestimate the power of human stupidity.
Time is your total capital, and the minutes of your life are painfully few.
The hardest part of gaining any new idea is sweeping out the false idea occupying that niche.
Love is the condition in which the happiness of another person is essential to your own.
I've been afraid so many times that I am no longer scared to be afraid again. What can't be cured must be endured.
If you don't like yourself, you can't like other people.
When one teaches, two learn.
A man can face known danger. But the unknown frightens him.
Anything free costs twice as much in the long run or turns out worthless.
