Musannaf Ibn Abi Shaybah 37690 — Awn bin Abdullah

It is narrated from Awn bin Abdullah that he said: Part of the perfection of piety is that, along with what you know of it, you seek the knowledge of what you do not know. And know that the deficiency in your knowledge is abandoning the search for more of it. And what leads a man to abandon the search for more in what he knows is only the little benefit he draws from what he knows.