“Predition is risky, especially of the future.”

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.

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.

Aristocrats have heirs; the poor have children; the rest keep dogs.

If people from Poland are called Poles, why aren’t people from Holland called Holes?

When I turned two I was really anxious, because I’d doubled my age in a year. I thought, if this keeps up, by the time I’m six I’ll be ninety.

How come abbreviated is such a long word?

If at first you don’t succeed, then skydiving definitely isn’t for you.

Five out of four people have trouble with fractions.

Chaos in the midst of chaos isn’t funny, but chaos in the midst of order is.

I actually learned about sex watching neighborhood dogs. And it was good. Go ahead and laugh. I think the most important thing I learned was: Never let go of the girl’s leg, no matter how hard she tries to shake you off.