Never underestimate the power of human stupidity.
Robert A. Heinlein

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

No statement should be believed because it is made by an authority.
Robert A. Heinlein

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.
Robert A. Heinlein

One man's "magic" is another man's engineering. "Supernatural" is a null word.
Robert A. Heinlein

One man's theology is another man's belly laugh.
Robert A. Heinlein

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

Political tags - such as royalist, communist, democrat, populist, fascist, liberal, conservative, and so forth - are never basic criteria. The human race divides politically into those who want people to be controlled and those who have no such desire.
Robert A. Heinlein

Sex without love is merely healthy exercise.
Robert A. Heinlein

The difference between science and the fuzzy subjects is that science requires reasoning while those other subjects merely require scholarship.
Robert A. Heinlein

The supreme irony of life is that hardly anyone gets out of it alive.
Robert A. Heinlein

The universe never did make sense; I suspect it was built on government contract.
Robert A. Heinlein

Theology is never any help; it is searching in a dark cellar at midnight for a black cat that isn't there. Theologians can persuade themselves of anything.
Robert A. Heinlein

There is no way that writers can be tamed and rendered civilized or even cured. the only solution known to science is to provide the patient with an isolation room, where he can endure the acute stages in private and where food can be poked in to him with a stick.
Robert A. Heinlein

They didn't want it good, they wanted it Wednesday.
Robert A. Heinlein

To be matter-of-fact about the world is to blunder into fantasy - and dull fantasy at that, as the real world is strange and wonderful.
Robert A. Heinlein

When a place gets crowded enough to require ID's, social collapse is not far away. It is time to go elsewhere. The best thing about space travel is that it made it possible to go elsewhere.
Robert A. Heinlein

When any government, or any church for that matter, undertakes to say to its subjects, This you may not read, this you must not see, this you are forbidden to know, the end result is tyranny and oppression no matter how holy the motives.
Robert A. Heinlein

Women and cats will do as they please, and men and dogs should relax and get used to the idea.
Robert A. Heinlein

Writing is not necessarily something to be ashamed of, but do it in private and wash your hands afterwards.
Robert A. Heinlein