The great questions are those an intelligent child asks and, getting no answers, stops asking.

There's life all over this universe, but the only life in the solar system is on earth, and in the whole universe we are the only men.

Dropping those atomic bombs on Hiroshima and Nagasaki was a war crime.

Civilization will end within 15 or 30 years unless immediate action is taken against problems facing mankind.

It would be a poor thing to be an atom in a universe without physicists, and physicists are made of atoms. A physicist is an atom's way of knowing about atoms.

A physicist is an atom's way of knowing about atoms.

I have lived much of my life among molecules. They are good company.

We are the products of editing, rather than of authorship.

I do not want to believe in God. Therefore I choose to believe in that which I know is scientifically impossible, spontaneous generation leading to evolution.

All War Departments are now Defense Departments. This is all part of the doubletalk of our time. The aggressor is always on the other side.

I tell my students to try early in life to find an unattainable objective.

Had I not gone through my past struggles, I wouldn't be as strong as I am at present.

We are under a Constitution but the Constitution is what the judges say it is.

Sometimes you forget you're famous. You wonder, Why is that person staring at me?

The things you get fired for when you’re young are the same things that you get lifetime achievement awards for when you’re old.

Books fall open, you fall in. When you climb out again, you're a bit larger than you used to be.

I try to keep away from being big-headed. That's what causes people to lose the acting thing. They start being commercial, and then they stink for the rest of their lives.

I've always been very sensible with money.

Having children obviously changes your priorities, but when you start to see life through these innocent eyes and seeing everything for the first time, you appreciate the small things.

I'm easy to look at, but so hard to see.

Cruelty is cruelty, whether it's cruelty to children, to the elderly, to dogs and cats, or to chickens.