Every sentence I utter must be understood not as an affirmation but as a question.[A caution he gives his students, to be wary of dogmatism.]

A physicist is just an atom's way of looking at itself.

Everything we call real is made of things that cannot be regarded as real.

If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.

An expert is a man who has made all the mistakes which can be made, in a narrow field.

When we measure something we are forcing an undetermined, undefined world to assume an experimental value. We are not measuring the world, we are creating it.

I go into the Upanishads to ask questions.

There are some things so serious you have to laugh at them.

The best weapon of a dictatorship is secrecy, but the best weapon of a democracy should be the weapon of openness.

Nothing exists until it is measured.

No, no, you're not thinking; you're just being logical.

A person who is too proud in love will suffer from the devastating bitterness in the end.

Finally, the intercom crackles and Hatmitch's acerbic laugh fills the studio. He contains himself just long enough to say, 'And that, my friends, is how a revolution dies.

What you have to do to achieve what you want necessitates the creative actualization of the totality of your being as it is. Nothing more, but also nothing less.

I believe in steel swords, gold coins, and man's wits. (...) And I believe there once were dragons. I've seen their skulls, after all.

Simonides, a poet famous in his generation, is, I think, author of the oldest satire that is now extant, and, as some say, of the first that was ever written.

In the small town of Hannibal, Missouri, when I was a boy, everybody was poor, but didn't know it; and everybody was comfortable and did know it.

So many of my family and friends had lost their battles against cancer. What could I do that my relatives and friends had not? What could I do that would be different?

I have to say that flying on Air Force One sort of spoils you for coach on a regular airline.

If there is one thing I can't stand, it is stupidity. I always say that stupidity is the Sin against the Holy Ghost.

What peace can we hope to find elsewhere if we have none within us