The more I see, the less I know for sure.

I am not an Athenian or a Greek, but a citizen of the world.

Where there is shouting, there is no true knowledge.

A clever person solves a problem. A wise person avoids it.

My brain is only a receiver, in the Universe there is a core from which we obtain knowledge, strength and inspiration. I have not penetrated into the secrets of this core, but I know that it exists.

Insanity is doing the same thing over and over again and expecting different results.

I have no special talents. I am only passionately curious.

Once we accept our limits, we go beyond them.

Why does the eye see a thing more clearly in dreams than the imagination when awake?