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

Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. That's relativity.

Life is like riding a bicycle. To keep your balance you must keep moving.

Try to become not a man of success, but try rather to become a man of value.

Coincidence is God's way of remaining anonymous.

The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it.

The secret to creativity is knowing how to hide your sources.

Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution.

I do not know with what weapons World War III will be fought, but World War IV will be fought with sticks and stones. Letter to Harry S. Truman.

Computers are incredibly fast, accurate and stupid. Human beings are incredibly slow, inaccurate and brilliant. Together they are powerful beyond imagination.