1 Critob. I am charmed with the exuberance of your eloquence, but at the same time I would remind you that, “In the multitude of words there wants not transgression.” And how does it bear upon the question before us? You will surely admit that those who have received Christian baptism are without sin. And that being free from sin they are righteous. And that once they are righteous, they can, if they take care, preserve their righteousness, and so through life avoid all sin.
Attic. Do you not blush to follow the opinion of Jovinian, which has been exploded and condemned? For he relies upon just the same proofs and arguments as you do; nay, rather, you are all eagerness for his inventions, and desire to preach in the East what was formerly condemned at Rome, and not long ago in Africa. Read then the reply which was given to him, and you will there find the answer to yourself. For in the discussion of doctrines and disputed points, we must have regard not to persons but to things. And yet let me tell you that baptism condones past offenses, and does not preserve righteousness in the time to come; the keeping of that is dependent on toil and industry, as well as earnestness, and above all on the mercy of God. It is ours to ask, to Him it belongs to bestow what we ask; ours to begin, His it is to finish; ours to offer what we can, His to fulfil what we cannot perform. “For except the Lord build the house, they labour in vain that build it. Except the Lord keep the city, the watchman wakes but in vain.” Wherefore the Apostle bids us so run that we may attain. All indeed run, but one receives the crown. And in the Psalm it is written, “O Lord, you have crowned us with your favour as with a shield.” For our victory is won and the crown of our victory is gained by His protection and through His shield; and here we run that hereafter we may attain; there he shall receive the crown who in this world has proved the conqueror. And when we have been baptized we are told, “Behold you are made whole; sin no more lest a worse thing happen unto you.” And again, “Do you not know that you are a temple of God, and that the Spirit of God dwells in you? If any man profane the temple of God, him shall God destroy.” And in another place, “The Lord is with you so long as you are with Him: if you forsake Him, He will also forsake you.” Where is the man, do you suppose, in whom as in a shrine and sanctuary the purity of Christ is permanent, and in whose case the serenity of the temple is saddened by no cloud of sin? We cannot always have the same countenance, though the philosophers falsely boast that this was the experience of Socrates; how much less can our minds be always the same! As men have many expressions of countenance, so also do the feelings of their hearts vary. If it were possible for us to be always immersed in the waters of baptism, sins would fly over our heads and leave us untouched. The Holy Spirit would protect us. But the enemy assails us, and when conquered does not depart, but is ever lying in ambush, that he may secretly shoot the upright in heart.
Source: Against the Pelagians (New Advent)