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

The only true wisdom is in knowing you know nothing.

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

Be as you wish to seem.

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

I'm not afraid of death because I don't believe in it.

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

Strong minds discuss ideas, average minds discuss events, weak minds discuss people

The fear of death follows from the fear of life. A man who lives fully is prepared to die at any time.