By James V. Schall, S.J., The Catholic Thing - In today’s cockeyed world, for reasons obvious to everyone but the morally obtuse (of whom a goodly supply seems available, present company not necessarily excluded), Psalm 51 is worth recalling. The most famous of the four Penitential Psalms, its context is the prayer before the prophet Nathan when David acknowledges his most famous sin. He does not presume that sin is impossible or something he “might” commit in some vague future.