He exhorts him to act with moderation towards two bishops who have offended him
Leo, the bishop, to Rusticus, bishop of Gallia Narbonensis.
Your letter, brother, which Hermes your archdeacon brought, I have gladly received; the number of different matters it contains makes it indeed lengthy, but not so tedious to me on a patient perusal that any point should be passed over, amid the cares that press upon me from all sides. And hence having grasped the gist of your allegation and reviewed what took place at the inquiry of the bishops and leading men, we gather that Sabinian and Leo, presbyters, lacked confidence in your action, and that they have no longer any just cause for complaint, seeing that of their own accord they withdrew from the discussion that had been begun. What form or what measure of justice you ought to mete out to them I leave to your own discretion advising you, however, with the exhortation of love that to the healing of the sick you ought to apply spiritual medicine, and that remembering the Scripture which says “be not over just,” you should act with mildness towards these who in zeal for chastity seem to have exceeded the limits of vengeance, lest the devil, who deceived the adulterers, should triumph over the avengers of the adultery.
Source: Letters (New Advent)