I don't want to write an autobiography because I would become public property with no privacy left.

The human race shouldn't have all its eggs in one basket, or on one planet. Let's hope we can avoid dropping the basket until we have spread the load.

I have sold more books on physics than Madonna has on sex.

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

Humanities deepest desire for knowledge is justification enough for continuing our quest. and our goal is nothing less than a complete description of the universe we live in.

My first popular book, 'A Brief History of Time,' aroused a great deal of interest, but many found it difficult to understand.

Not only that God does play dice, but that He sometimes confuses us by throwing them where they can't be seen.