The study of the Confetior, a prayer of the Penitential Act, didn't disappoint.
Be sure to read my newsletter about those "things we have failed to do." Let's make them the "things we have NOT failed to do!"
Fr. Michael Schmitz: Mortal vs. Venial Sin
Catechism of the Catholic Church: Mercy and Sin
10 Things that Forgive Venial Sins