Meanwhile, fears of universal disaster sank to an all time low over the world.

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.

A thorn is a rose's friend but a gardener’s enemy.

Often fear is the same emotion as excitement. It means you are breaking ground.

I love it when people want to interpret my books.

1. "What do you really want to get out of life?" 2. "What can you offer the world that no one else can?

Call on a business man only at business times, and on business; transact your business, and go about your business, in order to give him time to finish his business.

When a shadow flits across the landscape of the soul where is the substance?

Men of sense, whatever you may choose to say, do not want silly wives.

It's up to the people. If they really want to keep it going, they'll keep it going... they'll appreciate the music.

There's a kind of virgin one only becomes with difficulty.

I deserve to be happy. I'm sad it took me so long to get that. But I get it now.