The secret of change is to focus all of your energy, not on fighting the old, but on building the new.

A journey of a thousand miles begins with a single step.

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.

Knowing yourself is the beginning of all wisdom.

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.

If you tell the truth, you don't have to remember anything.

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

Always go too far, because that's where you'll find the truth.