A proverb

I was just reminded of an old saying my Mom taught me a long time ago; and I don't want to forget it.

He who knows not, and knows not that he knows not, is a fool; shun him.
He who knows not, and knows that he knows not, is a child; teach him.
He who knows, and knows not that he knows, is blind; lead him.
He who knows, and knows that he knows, is wise; follow him.