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

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

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.

If you think you understand it, that only shows that you don’t know the first thing about it.

One moment can change your life. You just need to be ready to explore, be ready to experiment and be consistent.

See now the power of truth; the same experiment which at first glance seemed to show one thing, when more carefully examined, assures us of the contrary.