April 13th
Book Four, Chapter 7
On the Examination of our own Conscience, and of a Resolution of Amendment

Examine diligently your conscience, and to the best of your power cleanse and purify it by a true contrition and humble confession....For there is no oblation  more worthy, no satisfaction greater, for the washing away of sins, than to offer yourself purely and entirely to God, together with the Oblation of the Body of Christ, in the Mass, and in the Communion.  If a man does what lies in him, and is truly penitent, as often as he shall approach to Me for pardon and grace, I live, says the Lord, and I will not the death of the sinner, but rather that he be converted and live; wherefore I will no longer remember his sins, but all shall be forgiven him.