85 And since no one can be without some adversities, let us take care that they do not happen to us through our own fault. For no one is more severely condemned by the judgment of others, than a foolish man, who is the cause of his misfortunes, is condemned by his own. For which reason we should decline matters which are full of trouble and contention, which have no advantage, but cause hindrances. Although we ought to take care not to have to repent our decisions or acts. For it is the part of a prudent man to look forward, so as not often to have to repent, for never to repent belongs to God alone. But what is the fruit of righteousness, but tranquillity of mind? Or what is to live righteously but to live with tranquility? Such as is the pattern of the master, such is the condition of the whole house. But if these things are requisite in a house, how much more in the Church, “where we, both rich and poor, bond and free, Greek and Scythian, noble and common, are all one in Christ Jesus.”
Source: Letters (New Advent)