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

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.

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.

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.

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

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

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

Lady Nancy Astor: Winston, if you were my husband, I'd poison your tea.
Churchill: Nancy, if I were your husband, I'd drink it.

Change before you have to.

Don't count the days, make the days count.

Everything has its beauty but not everyone sees it.

To improve is to change. To be perfect is to change often.

Find purpose, the means will follow.

I want to stay as close to the edge as I can without going over. Out on the edge you see all kinds of things you can't see from the center.

Don't get set into one form, adapt it and build your own, and let it grow, be like water. Empty your mind, be formless, shapeless — like water. Now you put water in a cup, it becomes the cup; You put water into a bottle it becomes the bottle; You put it into a teapot it becomes the teapot. Now, water can flow or it can crash. Be water, my friend.

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

Somewhere, something incredible is waiting to be known.

It takes 20 years to build a reputation and five minutes to ruin it. If you think about that, you'll do things differently.

Software is like sex; it's better when it's free.

Anything you don't understand, Mr. Rankin, you attribute to God. God for you is where you sweep away all the mysteries of the world, all the challenges to our intelligence. You simply turn your mind off and say God did it.