“I never learned from a man who agreed with me.”

It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so.

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

An armed society is a polite society.

One man’s theology is another man’s belly laugh.

Manners are good when one may have to back up his acts with his life.

Theology is never any help; it is searching in a dark cellar at midnight for a black cat that isn’t there.

It’s an indulgence to sit in a room and discuss your beliefs as if they were a juicy piece of gossip.

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.

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

When a place gets crowded enough to require ID’s, social collapse is not far away. It is time to go elsewhere.

Yield to temptation. It may not pass your way again.

Theologians can persuade themselves of anything.

Everything is theoretically impossible, until it is done.

I am free because I know that I alone am morally responsible for everything I do.

There is no way that writers can be tamed and rendered civilized or even cured.

The best thing about space travel is that it made it possible to go elsewhere.