21 Who is there even of God's elect that would not be disturbed at these and similar passages of Holy Scripture which our crafty opponent, with a perverse ingenuity, twists to the support of his own views? The Apostle John says that many Antichrists had come, and to make no difference between John himself and the lowest penitent is the preaching of a real Antichrist. At the same time, I am amazed at the portentous forms which Jovinianus, as slippery as a snake and like another Proteus, so rapidly assumes.
In sexual intercourse and full feeding he is an Epicurean; in the distribution of rewards and punishments he all at once becomes a Stoic, He exchanges Jerusalem for Citium, Judæa for Cyprus, Christ for Zeno. If we may not depart a hair's breadth from virtue, and all sins are equal, and a man who in a fit of hunger steals a piece of bread is no less guilty than he who slays a man: you must, in your turn, be held guilty of the greatest crimes. The case is different if you say that you have no sin, not even the least, and if, although all apostles and prophets and all the saints (as I have maintained in dealing with his second proposition) bewail their sinfulness, you alone boast of your righteousness.
But a minute ago you were barefooted: now you not only wear shoes, but decorated ones. Just now you wore a rough coat and a dirty shirt, you were grimy, and haggard, and your hand was horny with toil: now you are clad in linen and silks, and strut like an exquisite in the fashions of the Atrebates and the Laodiceans. Your cheeks are ruddy, your skin sleek, your hair smoothed down in front and behind, your belly protrudes, your shoulders are little mountains, your neck full and so loaded with fat that the half-smothered words can scarce make their escape.
Surely in such extremes of dress and mode of life there must be sin on the one side or the other. I will not assert that the sin lies in the food or clothing, but that such fickleness and changing for the worse is almost censurable in itself. And what we censure, is far removed from virtue; and what is far from virtue becomes the property of vice; and what is proved to be vicious is one with sin. Now sin, according to you, is placed on the left hand, and corresponds to the goats. You must, therefore, return to your old habits if you are to be a sheep on the right hand; or, if you perversely repent of your former views and change them for others, whether you like it or not, and although you shave off your beard, you will be reckoned among the goats.
Source: Against Jovinianus (New Advent)