Serm. in Mont., ii, 23: When the Lord had said that there were few that find the strait gate and narrow way, that heretics, who often commend themselves because of the smallness of their numbers, might not here intrude themselves, He straightway subjoins, “Take heed of false prophets.”.
Serm. in Mont., ii, 24: Wherefore it is justly asked, what fruits then He would have us look to? For many esteem among fruits some things which pertain to the sheep's clothing, and in this manner are deceived concerning wolves. For they practise fasting, almsgiving, or praying, which they display before men, seeking to please those to whom these things seem difficult. These then are not the fruits by which He teaches us to discern them. Those deeds which are done with good intention, are the proper fleece of the sheep itself, such as are done with bad intention, orin error, are nothing else than a clothing of wolves; but the sheep ought notto hate their own clothing because it is often used to hide wolves. What then are the fruits by which we may know an evil tree? The Apostle says, “The works of the flesh are manifest, which are, fornication, uncleanness” And which are they by which we may know a good tree? The same Apostle teaches, saying, “The fruits of the Spirit are love, joy, peace.”.
non occ.: But from their actions we may conjecture whether this their outward appearance is put on for display. For when by any temptations those things are withdrawn or denied them which they had either attained or sought to attain by this evil, then needs must that it appear whether they be the wolf in sheep's clothing, or the sheep in his own.
Serm. in Mont., ii, 25: In this place we must guard against the error of such as imagine that the two trees refer to two different natures; the one of God, the other not. But we affirm that they derive no countenance from these two tree; as it will be evident to any who will read the context that He is speaking here of men.
City of God, book 12, ch. 4: These men of whom we have spoken are offended with these two natures, not considering them according to their true usefulness; whereas it is not by our advantage or disadvantage, but in itself considered, that nature gives glory to her Framer. All natures then that are, because they are, have their own manner, their own appearance, and as it were their own harmony , and are altogether good.
Serm. in Mont., ii, 25: From this speech the Manichees suppose that neither cana soul that is evil be possibly changed for better, nor one that is good into worse. As though it had been, A good tree cannot become bad, nor a bad tree become good; whereas it is thus said, “A good tree cannot bring forth evil fruit,” nor the reverse. The tree is the soul, that is, the man himself; the fruit is the man’s works. An evil man therefore cannot work good works, nor agood man evil works. Therefore if an evil man would work good things, let him first become good. But as long as he continues evil, he cannot bring forth good fruits. Like as it is indeed possible that what was once snow, should cease tobe so; but it cannot be that snow should be warm; so it is possible that he who has been evil should be so no longer; but it is impossible that an evil man should do good. For though he may sometimes be useful, it is not he that does it, but it comes of Divine Providence super-intending.
see Op. Imp. in Jul. v. 40: But as it is manifest that all evil works proceed from an evil will, as its fruits from an evil tree; so of this evil will itself whence will you say that it has sprung, except that the evil will of an angel sprung from an angel, of man from man? And what were these two before those evils arose in them, but the good work of God, a good and praiseworthy nature. See then out of good arises evil; nor was there any thing at all out of which it might arise but what was good. I meanthe evil will itself, since there was no evil before it, no evil works, which could not come but from evil will as fruit from an evil tree. Nor can it be said that it sprung out of good in this way, because it was made good by a good God; for it was made of nothing, and not of God.
