“Truth and clarity are complementary.”

What is that we human beings ultimately depend on? We depend on our words. We are suspended in language. Our task is to communicate experience and ideas to others.

The meaning of life consists in the fact that it makes no sense to say that life has no meaning.

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

It is a great pity that human beings cannot find all of their satisfaction in scientific contemplativeness.

There are two sorts of truth: trivialities, where opposites are clearly absurd, and profound truths, recognised by the fact that the opposite is also a profound truth.

If an idea does not appear bizarre, there is no hope for it.

How wonderful that we have met with a paradox. Now we have some hope of making progress.

Address to Albert Einstein: You are not thinking. You are merely being logical.

When it comes to atoms, language can be used only as in poetry.

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

One must always do what one really cannot.

There is no hope for any speculation that does not look absurd at first glance.

The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.

If anybody says he can think about quantum physics without getting giddy, that only shows he has not understood the first thing about them.

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.

Extraordinary claims require extraordinary evidence.

Science is a way to not fool ourselves.

I have experimental evidence that time travel is not possible.

Science can explain the universe without the need for a Creator.

Science is an attempt, largely successful, to understand the world, to get a grip on things, to get hold of ourselves, to steer a safe course.

If we knew what it was we were doing, it would not be called research, would it?

Somewhere, something incredible is waiting to be known.

One is always a long way from solving a problem until one actually has the answer.