Quotes by Robert A. Heinlein

The universe never did make sense I suspect it was built on government contract.

Love is that condition in which the happiness of another person is essential to your own... Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one for the other, or assumes that the greater the love, the greater the jealousy.

One could write a history of science in reverse by assembling the solemn pronouncements of highest authority about what could not be done and could never happen.

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

Love is that condition in which the happiness of another person is essential to your own... Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one for the other, or assumes that the greater the love, the greater the jealousy.

I never learned from a man who agreed with me.

An armed society is a polite society. Manners are good when one may have to back up his acts with his life.

One of the sanest, surest, and most generous joys of life comes from being happy over the good fortune of others.

Love is that condition in which the happiness of another person is essential to your own... Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one for the other, or assumes that the greater the love, the greater the jealousy.

Sex without love is merely healthy exercise.