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.

Death may be the greatest of all human blessings.

An honest man is always a child.

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