We're forever teetering on the brink of the unknowable, and trying to understand what can't be understood.

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.

We had won the war, but when the insurgency reared its ugly head, we lost everything we had gained.

Treat your clients with high professionalism and they will no more negotiate with you.

Never under any circumstances permit anyone to belittle your self-worth.

Am I not destroying my enemies when I make friends of them?

I, who called love my hope for love.

I believe in possibility, but I'm not sure I believe in demons.

There are two kinds of people in boxing. Those who say, 'Oh, boy; Tom Hauser is writing an article about me,' and those who say, 'Big problem; Tom Hauser is writing an article about me.'

If you talk about yourself, he'll think you're boring. If you talk about others, he'll think you're a gossip. If you talk about him, he'll think you're a brilliant conversationalist.

I want nothing from love, in short, but love.

A great man knows the value of greatness; he dares not hazard it, he will not squander it.