1 Cyprian to his brother Stephen, greeting. Faustinus our colleague, abiding at Lyons, has once and again written to me, dearest brother, informing me of those things which also I certainly know to have been told to you, as well by him as by others our fellow bishops established in the same province, that Marcianus, who abides at Aries, has associated himself with Novatian, and has departed from the unity of the Catholic Church, and from the agreement of our body and priesthood, holding that most extreme depravity of heretical presumption, that the comforts and aids of divine love and paternal tenderness are closed to the servants of God who repent, and mourn, and knock at the gate of the Church with tears, and groans, and grief; and that those who are wounded are not admitted for the soothing of their wounds, but that, forsaken without hope of peace and communion, they must be thrown to become the prey of wolves and the booty of the devil; which matter, dearest brother, it is our business to advise for and to aid in, since we who consider the divine clemency, and hold the balance in governingthe Church, do thus exhibit the rebuke of vigour to sinners in such a way as that, nevertheless, we do not refuse the medicine of divine goodness and mercy in raising the lapsed and healing the wounded.
Source: The Epistles of Cyprian (New Advent)