“Prediction is very difficult, especially if it’s about the future.”

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.

The most difficult thing is the decision to act!

He who thinks with difficulty believes with alacrity.

Our difficulties launch us into new states of consciousness where we are inspired to step out of the reality of our smallest thoughts and step into the limitless freedom of our biggest dreams.

It’s difficult to think anything but pleasant thoughts while eating a homegrown tomato.

To step into acting was not that difficult a transition to make. What was difficult was the work and the practice that went into becoming good at it, because I hadn’t had any training.

Here’s the difficulty about suicide: it is an act of ambition that can be committed only when one has passed beyond ambition.

Faith enables many of us to endure life’s difficulties with an equanimity that would be scarcely conceivable in a world lit only by reason.

The older we become, the more difficult it is to fill our hearts with wonder. Only God is big enough to keep filling us with wonder.