You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.

One must always do what one really cannot.

We are trapped by language to such a degree that every attempt to formulate insight is a play on words.

If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.

A deep truth is a truth so deep that not only is it true but it's exact opposite is also true.

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.

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