My friend...care for your psyche...know thyself, for once we know ourselves, we may learn how to care for ourselves.

I am a fool, but I know I'm a fool and that makes me smarter than you.

Knowing thyself is the height of wisdom.

Wisdom is knowing what you don't know.

The man who is truly wise knows that he knows very little.

The more I learn, the less I realize I know.