Four Kinds
The man who knows not that he knows not aught,
He is a fool; no light shall ever reach him.
Who knows he knows not, and would fain be taught,
He is but simple; take thou him and teach him.
But whoso knowing, knows not that he knows,
He is asleep; go thou to him and wake him.
The truly wise both knows, and knows he knows;
Cleave thou to him, and never more forsake him.