“Accuracy and clarity of statement are mutually exclusive.”

It is not enough to be wrong, one must also be polite.

You must come to Copenhagen to work with us. We like people who can actually perform thought experiments!

No paradox, no progress.

There are trivial truths and the great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true.

Opposites are not contradictory but complementary.

The present state of atomic theory is characterized by the fact that we not only believe the existence of atoms to be proved beyond a doubt, but also we even believe that we have an intimate knowledge of the constituents of the individual atoms.

Oh what idiots we have all been, this is just as it must be.

Predition is risky, especially of the future.

Truth and clarity are complementary.

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

It is the hallmark of any deep truth that its negation is also a deep truth.

In the great drama of existence we are audience and actors at the same time.

We are trapped by language to such a degree that every attempt to formulate insight is a play on words.

The great extension of our experience in recent years has brought light to the insufficiency of our simple mechanical conceptions and, as a consequence, has shaken the foundation on which the customary interpretation of observation was based.

A person who wasn’t outraged on first hearing about quantum theory didn’t understand what had been said.

The measurement we get when we measure something is not a property of the thing measured.

Men, like animals, naturally multiply in proportion to the means of their subsistence.

Why should I worry about the biological clock ticking? Saif is 10 years older. He should be worried.

We are all connected; to each other, biologically. To the Earth, chemically. And to the rest of the universe, atomically.

Wonder and not any expectation of advantage from its discoveries, is the first principle which prompts mankind to the study of Philosophy, of that science which pretends to lay open the concealed connections that unite the various appearances of nature.

Science is the great antidote to the poison of enthusiasm and superstition.

There has no doubt to be fundamental research in science, but applied research is equally important for new improvements and changes in our techniques.

Politics without principles, Education without character, Science without humanity, and Commerce without morality are not only useless, but also positively dangerous.

Every sentence I utter must be understood not as an affirmation, but as a question.