Sacerdotii Nostri Primordia §91

⁹¹ From his experience in the tribunal of Penance, in which he loosed the bonds of sin, he understood just how much malice there is in sin and what terrible devastation it wreaks in the souls of men. He used to paint it in hideous colors: "If we"—he asserted—"had the faith to see a soul in mortal sin, we would die of fright." (93)