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

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.

If you want to be happy, be.

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

Everyone thinks of changing the world, but no one thinks of changing himself.

Respect was invented to cover the empty place where love should be.