Anyone who has never made a mistake has never tried anything new.

Everything you can imagine is real.

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

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

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

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.

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

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