Intelligence is the ability to adapt to change.

Think good, and good follows. Think evil, and evil follows. You are what you think all day long.

I am not an Athenian or a Greek, but a citizen of the world.

The future depends on what you do today.

Happiness is when what you think, what you say, and what you do are in harmony.

You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete.

The best way to find yourself is to lose yourself in the service of others.

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

No matter what people tell you, words and ideas can change the world.