Be as you wish to seem.

Ignorance, the root and stem of all evil.

The more I see, the less I know for sure.

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

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.

Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.

Death may be the greatest of all human blessings.

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