We are very, very small, but we are profoundly capable of very, very big things.

People won't have time for you if you are always angry or complaining.

I used to think information was destroyed in black hole. This was my biggest blunder, or at least my biggest blunder in science.

It would be very difficult to explain why the universe should have begun in just this way, except as the act of a God who intended to create beings like us.

A million million million million (1 with twenty-four zeros after it) miles, the size of the observable universe.

In A Brief History Of Time I used the word "God" like Einstein did as a shorthand for the laws of physics. However, this is not what most people mean by God, so I have decided not to use the term. The laws of physics can explain the universe without the need for a God.

I don't think the human race will survive the next thousand years, unless we spread into space. There are too many accidents that can befall life on a single planet. But I'm an optimist. We will reach out to the stars.