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

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.

Where there is shouting, there is no true knowledge.

Death may be the greatest of all human blessings.

The most important knowledge is that which guides the way you lead your life.

An honest man is always a child.

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

I cannot teach anybody anything. I can only make them think.