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.

Speak only if it improves upon the silence.

Live as if you were to die tomorrow. Learn as if you were to live forever.

Coincidence is God's way of remaining anonymous.

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

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.

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

A leader leads by example not by force.

Remembering that I'll be dead soon is the most important tool I've ever encountered to help me make the big choices in life. Because almost everything — all external expectations, all pride, all fear of embarrassment or failure - these things just fall away in the face of death, leaving only what is truly important. Remembering that you are going to die is the best way I know to avoid the trap of thinking you have something to lose. You are already naked. There is no reason not to follow your heart.

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.

If you are going through hell, keep going.

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

He who is not contented with what he has, would not be contented with what he would like to have.

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

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

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.

Science without religion is lame, religion without science is blind.

Bessie Braddock: Sir, you are drunk.
Churchill: And you, madam, are ugly. But in the morning, I shall be sober.

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Education is what remains after one has forgotten everything he learned in school.

Mistakes are always forgivable, if one has the courage to admit them.

An eye for an eye will make the whole world blind.

The key to immortality is first living a life worth remembering.