Knowledge is mastery over the world.
Geography, history, biology, physics, politics, philosophy—vast wisdom exhausts a lifetime and yet might not fully grasp even a single field. Those who hoard all knowledge and step into omniscience truly deserve the title of "Divine Agent". As his incarnations, his creations, the Seven Deadly Sins aren't so omnipotent, inheriting only a portion of knowledge, but they've already far surpassed the heights countless scholars could never reach in their entire lives.
Dejir doesn't hate knowledge, in this respect he and Reggie are quite similar—reading and studying purely out of interest; Orgulous reads to scorn others, Gelite does so purely out of a possessive instinct, Jelas for work requirements, as for Gluttony and Sloth there's no need to mention them—these two have no interest in anything beyond their instincts.