Nicene and Post-Nicene Fathers, Vol. V:
A Treatise on the Merits and Forgiveness...: Chapter 11

Chapter 11.—The Ancients Assumed Original Sin.

You see with what confidence this great man expresses himself after the ancient and undoubted rule of faith. In advancing such very certain statements, his object was by help of these firm conclusions to prove the uncertain point which had been submitted to him by his correspondent, and concerning which he informs him that a decree of a council had been passed, to the effect that, if an infant were brought even before the eighth day after his birth, no one should hesitate to baptize him. Now it was not then determined or confirmed by the council that infants were held bound by original sin as if it were new, or as if it were attacked by the opposition of some one; but when another controversy was being conducted, and the question was discussed, in reference to the law of the circumcision of the flesh, whether they ought to be baptized before the eighth day. None agreed with the person who denied this; because it was not an open question admitting of discussion, but was fixed and unassailable, that the soul would forfeit eternal salvation if it ended this life without obtaining the sacrament of baptism: but at the same time infants fresh from the womb were held to be affected only by the guilt of original sin. On this account, although remission of sins was easier in their case, because the sins were derived from another, it was nevertheless indispensable. It was on sure grounds like these that the uncertain question of the eighth day was solved, and the council decided that after a man was born, not a day ought to be lost in rendering him that succour which should prevent his perishing for ever. When also a reason was given for the circumcision of the flesh as being itself a shadow of what was to be, its purport was not that we should understand that baptism ought to be administered on the eighth day after birth, but rather that we are spiritually circumcised in the resurrection of Christ, who rose from the dead on the third day, indeed, after His passion, but among the days of the week, by which time is counted, on the eighth, that is, on the first day after the Sabbath.