A clever person solves a problem. A wise person avoids it.

Earth provides enough to satisfy every man’s need, but not any man’s greed.

In the beginning the Universe was created. This has made a lot of people very angry and has been widely regarded as a bad move.

Bad men live that they may eat and drink, whereas good men eat and drink that they may live.

Could I climb to the highest place in Athens, I would lift my voice and proclaim, "Fellow citizens, why do you turn and scrape every stone to gather wealth, and take so little care of your children to whom one day you must relinquish it all?"

Success is a lousy teacher. It seduces smart people into thinking they can't lose.

There seems to be some perverse human characteristic that likes to make easy things difficult.

Every one of us is precious in the cosmic perspective. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.

If you show people the problems and you show people the solutions they will be moved to act. At Live8, 2 July 2005.

If all misfortunes were laid in one common heap whence everyone must take an equal portion, most people would be contented to take their own and depart.

We are star stuff which has taken its destiny into its own hands.

The man who views the world at 50 the same as he did at 20 has wasted 30 years of his life.

Life is too short to be little. Man is never so manly as when he feels deeply, acts boldly, and expresses himself with frankness and with fervour.

The best way to prepare [to be a programmer] is to write programs, and to study great programs that other people have written. In my case, I went to the garbage cans at the Computer Science Center and fished out listings of their operating system.

I wish people would love everybody else the way they love me. It would be a better world.