Who knows what? ‘Knowledge’, a poem by an unknown author.
He who knows not, and knows not that he knows not, he is a fool,
Shun him!
He who knows not, and knows that he knows not, he is teachable,
Teach him!
He who knows, and knows not that he knows, he is asleep,
Wake him!
He who knows, and knows that he knows, he is wise,
Follow him!
Author Unknown