Carefully observe, then, what Cœlestius has advanced so very openly, and you will discover what amount of concealment Pelagius has practised upon you. Cœlestius goes on to say as follows: “That infants, however, must be baptized for the remission of sins, was not admitted by us with the view of our seeming to affirm sin by transmission. This is very alien from the catholic meaning, because sin is not born with a man,—it is subsequently committed by the man for it is shown to be a fault, not of nature, but of the will. It is fitting, therefore, to confess this, lest we should seem to make different kinds of baptism; it is, moreover, necessary to lay down this preliminary safeguard, lest by the occasion of this mystery evil should, to the disparagement of the Creator, be said to be conveyed to man by nature, before that it has been committed by man.” Now Pelagius was either afraid or ashamed to avow this to be his own opinion before you; although his disciple experienced neither a qualm nor a blush in openly professing it to be his, without any obscure subterfuges, in presence of the Apostolic See.
Reproduced in full. Translation: Nicene and Post-Nicene Fathers, series 1, vol. 5 (Schaff, 1887), public domain (Public domain).