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Collect: " O my Jesus, forgive us our sins, save us from the fire of hell, lead all souls to heaven, especially those who are in most need of Thy mercy. Amen."
In the Sed Contra, St. Thomas gives an argument from Jeremiah 15:1. The argumentation here is subtle. He is arguing from an exemplory instance. In it, it is proved that the merit was not condign in this case, for, if it was then God would've forgiven based on their merits, rather, merit in these case are congruent, i.e., out of the mercy of God. Thus, it is so with all lesser cases.