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

Logic will get you from A to Z, imagination will get you everywhere.

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

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

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.

The most important knowledge is that which guides the way you lead your life.

Only a life lived for others is a life worthwhile.

Once we accept our limits, we go beyond them.