II. He orders a provincial synod to be convened to receive the recantation of the heretics in express terms.
Accordingly, lest this should be attempted any further, and lest this pernicious habit, which owes its introduction to certain persons' negligence, should result in the overthrow of many souls, by this our authoritative injunction we charge you, brother, to give diligence that a synod of the clergy of your province be convened, and all, whether priests or deacons or clerics of any rank who have been re-admitted from their alliance with the Pelagians and the Cælestians into Catholic communion with such precipitation that they were not first constrained to recant their error, be now at least forced to a true correction, which can advantage themselves and hurt no one, since their deceitfulness has in part been disclosed.
Let them by their public confession condemn the authors of this presumptuous error and renounce all that the universal Church has repudiated in their doctrine: and let them announce by full and open statements, signed by their own hand, that they embrace and entirely approve of all the synodal decrees which the authority of the Apostolic See has ratified to the rooting out of this heresy. Let nothing obscure, nothing ambiguous be found in their words. For we know that their cunning is such that they reckon that the meaning of any particular clause of their execrable doctrine can be defended if they only keep it distinct from the main body of their damnable views.
Source: Letters (New Advent)