“One must always do what one really cannot.”

If we couldn’t laugh at ourselves, that would be the end of everything.

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

Physics is the belief that a simple and consistent description of nature is possible.

Some subjects are so serious that one can only joke about them.

Sometimes the child in one behaves a certain way and the rest of oneself follows behind, slowly shaking its head.

It is, indeed, perhaps the greatest prospect of humanistic studies to contribute through an increasing knowledge of the history of cultural development to that gradual removal of prejudices which is the common aim of all science.

We all know your idea is crazy. The question is whether it is crazy enough.

When it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images and establishing mental connections.

Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.

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

It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we say about nature.

If you aren’t confused by quantum mechanics, you haven’t really understood it.

Every valuable human being must be a radical and a rebel, for what he must aim at is to make things better than they are.

And anyone who thinks they can talk about quantum theory without feeling dizzy hasn’t yet understood the first thing about it.

Truth is something that we can attempt to doubt, and then perhaps, after much exertion, discover that part of the doubt is not justified.

We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct. My own feeling is that it is not crazy enough.

Sadness is silent, it is yours. It is coming because you are alone. It is giving you a chance to go deeper into your aloneness.

The easiest thing to be in the world is you. The most difficult thing to be is what other people want you to be. Don’t let them put you in that position.

If we stop defining each other by what we are not and start defining ourselves by what we are, we can all be freer.

We need to figure out how to have the things we love, and not destroy the world.

Just be yourself, there is no one better.

I knew I was going to take the wrong train, so I left early.

At the end of the day, you know yourself best.

A good decision today is better than a perfect decision tomorrow.