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.

I like your Christ. I do not like your Christians. Your Christians are so unlike your Christ.

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

Speak only if it improves upon the silence.

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.

A leader leads by example not by force.

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.

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.

There are many causes I would die for. There is not a single cause I would kill for.

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

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

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

You should be the change that you want to see in the world.

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

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

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

Spam will be a thing of the past in two years' time. 24 January 2004.

You cannot simultaneously prevent and prepare for war.

We are what we repeatedly do. Excellence, then, is a habit.