The greatest weapons in the conquest of knowledge are an understanding mind and the inexorable curiosity that drives it on.

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.

when you're cool for twenty, you get paid for twenty-one.

So a good man can be a bad Christian?""I suppose so.""Then a bad man, " I said, "can be a good Christian?

All this will not be finished in the first one hundred days. Nor will it be finished in the first one thousand days . . .nor even perhaps in our lifetime on this planet. But let us begin.

I spent my whole life trying not to be careless. Women and children can afford to be careless, but not men.

You couldn't catch a mouse if leaped in between your paws!

Fear is the genesis of most of the good things that have occurred in my life. Fear is the beginning of every success I've lived.

It's harder to be kind than clever

It's 2003. Why can't I teleport?

There are times when the welfare system may appear as an impediment to growth. Yet the drive for growth should always bear in mind the fact that people also need security

I have come to realize that Jesse Helms stands for everything in politics that is anathema to me.