There is only one good, knowledge, and one evil, ignorance.

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

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

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

Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.

Where there is shouting, there is no true knowledge.

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.

Only a life lived for others is a life worthwhile.

Once we accept our limits, we go beyond them.