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

If you are going through hell, keep going.

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

Success is going from failure to failure without a loss of enthusiasm.

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

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

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.

Reality is merely an illusion, albeit a very persistent one.

The United States invariably does the right thing, after having exhausted every other alternative.

Suppose you were an idiot. And suppose you were a member of Congress. But I repeat myself.

There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.

It has become appallingly obvious that our technology has exceeded our humanity.

History will be kind to me, for I intend to write it.

If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut.

It is harder to crack a prejudice than an atom.

I like pigs. Dogs look up to us. Cats look down on us. Pigs treat us as equals.

Not everything that counts can be counted, and not everything that can be counted counts. This was on a sign hanging in Einstein's office at Princeton, which is often quoted as a statement by him; research should be able to reveal whether or not it originated with Einstein.

I fear not the man who has practiced 10,000 kicks once, but I fear the man who has practiced one kick 10,000 times.

A wise man can learn more from a foolish question than a fool can learn from a wise answer.

If we knew what we were doing, it wouldn't be called research, would it?