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 asleep — wake him.
He who knows,
And knows that he knows,
Is wise — follow him.

Ibn Yamin (1286 – 1367)