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

Be the change that you wish to see in the world.

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

Imagine the end desired and feel its reality. Follow it through, and you will get definite results.

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.

If you can't explain it to a six year old, you don't understand it yourself.

Only a life lived for others is a life worthwhile.