IX. These injunctions to be carried out without contentiousness.
And so now that you see yourselves, beloved, fully instructed through David, our brother and fellow bishop, who is approved to us both by his personal character and his priestly worth, on [nearly] all the points which our brother Potentius' account contained, it remains, brothers, that you receive our healthful exhortations harmoniously, and that doing nothing in rivalry, but acting unanimously with entire devotion and zeal, you obey the constitution of God and His Apostles, and in nothing suffer the well-considered decrees of the canons to be violated.
For what we from the consideration of certain reasons have now relaxed must henceforward be guarded by the ancient rules, lest, what we have on this occasion with merciful lenity conceded, we may hereafter have to visit with condign punishment, acting with special and direct vigour against those who in ordaining bishops have neglected the statutes of the holy fathers, and have consecrated men whom they ought to have rejected. Wherefore if any bishops have consecrated such an one priest as ought not to be, even though in some measure they have escaped any loss of their personal dignity, yet they shall have no further right of ordination, nor shall ever be present at that sacrament which, neglecting the judgment of God, they have improperly conferred.
Source: Letters (New Advent)