Darius the Great on Wisdom:

FOUR KINDS OF MEN

There are four kinds of men:

He who knows not and knows not he knows not:

            he is a fool - shun him;

He who knows not and knows he knows not:

            he is simple - teach him;

He who knows and knows not he knows: he is asleep - wake him;

He who knows and knows he knows: he is wise - follow him.

-DARIUS THE PERSIAN