No one suggests that writing about science will turn the entire world into a model of judgment and creative thought. It will be enough if they spread the knowledge as widely as possible.

People who think they know everything are a great annoyance to those of us who do.

The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.

When stupidity is considered patriotism, it is unsafe to be intelligent.

So the universe is not quite as you thought it was. You'd better rearrange your beliefs, then. Because you certainly can't rearrange the universe.

In life, unlike chess, the game continues after checkmate.

People think of education as something that they can finish.

There are no nations! There is only humanity. And if we don't come to understand that right soon, there will be no nations, because there will be no humanity.

A robot may not injure a human being, or, through inaction, allow a human being to come to harm.

Violence is the last refuge of the incompetent.

A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

Why does a government agency that has no connection with my community have the right to dictate what is appropriate for it?

People scare me more than anything, for I know too well the savagery of which humankind is capable.

I was in love with the whole world and all that lived in its rainy arms.

Rogues in rags are kept in countenance by rogues in ruffles.

I take great pride in the fact that I have lived in a Spanish-speaking country.

To make women learned and foxes tame has the same effect - to make them more cunning.

If I say that God is good, that is not true. God is not good. I am good, and if I say that God is wise, that is not true. I am wiser than he is.

I was a rebellious kid, always getting into trouble.

Critics like to build you up, tear you down, and then, if you're lucky, build you up again.

Hang in there, retirement is only thirty years away!