17 C. I can put it off no longer; my patience is completely overcome by your iniquitous words. Tell me, pray, what sin have little infants committed. Neither the consciousness of wrong nor ignorance can be imputed to those who, according to the prophet Jonah, know not their right hand from their left. They cannot sin, and they can perish; their knees are too weak to walk, they utter inarticulate cries; we laugh at their attempts to speak; and, all the while, poor unfortunates! The torments of eternal misery are prepared for them.
A. Ah! now that your disciples have turned masters you begin to be fluent, not to say eloquent. Antony, an excellent orator, whose praises Tully loudly proclaims, says that he had seen many fluent men, but so far never an eloquent speaker; so don't amuse me with flowers of oratory which have not grown in your own garden, and with which the ears of inexperience and of boyhood are wont to be tickled, but plainly tell me what you think.
C. What I say is this— you must at least allow that they have no sin who cannot sin.
A. I will allow it, if they have been baptized into Christ; and if you will not then immediately bind me to agree with your opinion that a man can be without sin if he chooses; for they neither have the power nor the will; but they are free from all sin through the grace of God, which they received in their baptism.
C. You force me to make an invidious remark and ask, Why, what sin have they committed? That you may immediately have me stoned in some popular tumult. You have not the power to kill me, but you certainly have the will.
A. He slays a heretic who allows him to be a heretic. But when we rebuke him we give him life; you may die to your heresy, and live to the Catholic faith.
C. If you know us to be heretics, why do you not accuse us?
A. Because the Apostle teaches me to avoid a heretic after the first and second admonition, not to accuse him. The Apostle knew that such an one is perverse and self-condemned. Besides, it would be the height of folly to make my faith depend on another man's judgment. For supposing some one were to call you a Catholic, am I to immediately give assent? Whoever defends you, and says that you rightly hold your perverse opinions, does not succeed in rescuing you from infamy, but charges himself with perfidy. Your numerous supporters will never prove you to be a Catholic, but will show that you are a heretic. But I would have such opinions as these suppressed by ecclesiastical authority; otherwise we shall be in the case of those who show some dreadful picture to a crying child. May the fear of God grant us this— to despise all other fears. Therefore, either defend your opinions, or abandon what you are unable to defend. Whoever may be called in to defend you must be enrolled as a partisan, not as a patron.
Source: Against the Pelagians (New Advent)