An entire floor of the Black Library is dedicated to the arcane study of his divinely exquisite one-liners.
He once beat Tzeentch Himself at chess. With a slight, paternal smile, the Commissar patted his opponent's hand. "Well played, dear fellow; you're not so bad for an amateur. Practice hard, then try me again in a century or so."
The Ultramarines, tired of their garish chapter colors, requested his services in designing a new uniform. His suggestions were so simple and so elegant that they were adopted immediately: "A stiff oxford shirt, collar open and unbuttoned, with a fine merino jacket and a pair of understated Armani cufflinks."
He is the most debonair and interesting man in the Imperium, and he is your new Commissar.
"I don't often fight Chaos... But when I do, I prefer Imperial Guardsmen at my side."
"Stay loyal to the Imperium, my friends."