Even so every good tree brings forth good fruit; but a corrupt tree brings forth evil fruit.
All Commentaries on Matthew 7:17 Go To Matthew 7
John Chrysostom
AD 407
Even though Jesus seems to make virtually the same point a second time, it is hardly redundant. For in the second time around he prevents anyone from concluding, “The evil tree bears evil fruit, but it also bears good fruit, so as to make it difficult to recognize an evil tree, because the crop is of two kinds.” No. Jesus says, “This is not so. For the evil tree bears only evil fruits and would never bear good fruits. So also it is the same way with the opposite kind of tree.” What then? Is there no such thing as a good person who becomes corrupt? Or a corrupt person who becomes good? Isn’t life full of many examples of such reversals? But the Messiah is not saying that the evil person is incapable of changing or that the good person will never fail in anything. But he is saying that so long as a person is living in a degenerate way, he will not be able to generate good fruit. For he may indeed change to virtue, being evil, but while continuing in wickedness, he will not bear good fruit. What then? Did not David, even though good, bear evil fruit? No, because he did not bear evil fruit while remaining good but while being changed. For if indeed he had remained continually good as he had been, he would not have produced the bad fruit. For it surely was not while abiding in the habits of excellence that he had the audacity to do the very things that he had the audacity to do. The Gospel of Matthew, Homily
