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

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

Be as you wish to seem.

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.

There's no one thing that's true. It's all true.

Those who know do not speak, those who speak do not know.

An honest man is always a child.

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