Quotes By Robert A. Heinlein

Everything is theoretically impossible, until it is done.

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

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.

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

Never worry about theory as long as the machinery does what it's supposed to do.

I never learned from a man who agreed with me.

I am free because I know that I alone am morally responsible for everything I do. I am free, no matter what rules surround me. If I find them tolerable, I tolerate them; if I find them too obnoxious, I break them. I am free because I know that I alone am morally responsible for everything I do.

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

For me, politeness is a sine qua non of civilization.

You can have peace. Or you can have freedom. Don't ever count on having both at once.

Don't handicap your children by making their lives easy.