Uncertainty that comes from knowledge (knowing what you don't know) is different from uncertainty coming from ignorance.

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.

An alcoholic is someone who can violate his standards faster than he can lower them.

It was strange, really. A couple months ago, I had thought I couldn’t live without him. Apparently I could.

I missed out on everything. Sometimes on the street I see teenagers hanging out and going to the movies, going to concerts, and I get so jealous.

I always found I was in the best of company, alone.

Frank is capable of any kind of behavior to win.

In Sea affairs, nothing is impossible, and nothing is improbable.

A man of moderate Understanding, thinks he writes divinely: A man of good Understanding, thinks he writes reasonably.

An air of fashion, which is but a badge of slavery ... proves that the soul has not a strong individual character.

She was the light of our lives, our anchor, compass and vision.

To give your sheep or cow a large, spacious meadow is the way to control him.