That the fast of Lent is not sufficient to make us competent to partake of the Communion, but that holiness is the first thing required. How it is possible not to entertain resentment, and that God takes much account of this law; and that the entertaining of resentment punishes those who are guilty of it even before they reach the place of torment.— Also concerning abstinence from oaths, and those who have not succeeded in abstaining from swearing.
Source: Homilies on the Statues (New Advent)