Translated by W. Moore and H. A. Wilson
The time, then, has come, and bears in its course the remembrance of holy mysteries, purifying man,--mysteries which purge out from soul and body even that sin which is hard to cleanse away, and which bring us back to that fairness of our first estate which God, the best of artificers, impressed upon us. Therefore it is that you, the initiated people, are gathered together; and you bring also that people who have not made trial of them, leading, like good fathers, by careful guidance, the uninitiated to the perfect reception of the faith. I for my part rejoice over both;--over you that are initiated, because you are enriched with a great gift: over you that are uninitiated, because you have a fair expectation of hope--remission of what is to be accounted for, release from bondage, close relation to God, free boldness of speech, and in place of servile subjection equality with the angels. For these things, and all that follow from them, the grace of Baptism secures and conveys to us. Therefore let us leave the other matters of the Scriptures for other occasions, and abide by the topic set before us, offering, as far as we may, the gifts that are proper and fitting for the feast: for each festival demands its own treatment. So we welcome a marriage with wedding songs; for mourning we bring the due offering with funeral strains; in times of business we speak seriously, at times of festivity we relax the concentration and strain of our minds; but each time we keep free from disturbance by things that are alien to its character.
Christ, then, was born as it were a few days ago--He Whose generation was before all things, sensible and intellectual. To-day He is baptized by John that He might cleanse him who was defiled, that He might bring the Spirit from above, and exalt man to heaven, that he who had fallen might be raised up and he who had cast him down might be put to shame. And marvel not if God showed so great earnestness in our cause: for it was with care on the part of him who did us wrong that the plot was laid against us; it is with forethought on the part of our Maker that we are saved. And he, that evil charmer, framing his new device of sin against our race, drew along his serpent train, a disguise worthy of his own intent, entering in his impurity into what was like himself,--dwelling, earthly and mundane as he was in will, in that creeping thing. But Christ, the repairer of his evil-doing, assumes manhood in its fulness, and saves man, and becomes the type and figure of us all, to sanctify the first-fruits of every action, and leave to His servants no doubt in their zeal for the tradition. Baptism, then, is a purification from sins, a remission of trespasses, a cause of renovation and regeneration. By regeneration, understand regeneration conceived in thought, not discerned by bodily sight. For we shall not, according to the Jew Nicodemus and his somewhat dull intelligence, change the old man into a child, nor shall we form anew him who is wrinkled and gray-headed to tenderness and youth, if we bring back the man again into his mother's womb: but we do bring back, by royal grace, him who bears the scars of sin, and has grown old in evil habits, to the innocence of the babe. For as the child new-born is free from accusations and from penalties, so too the child of regeneration has nothing for which to answer, being released by royal bounty from accountability  .
 The language of this passage, if strictly taken, seems to imply a denial of original sin; but it is perhaps not intended to be so understood.
Reference address : https://www.elpenor.org/nyssa/baptism-of-christ.asp?pg=2