John Chrysostom
Catena Aurea · Matthäusevangelium 12
Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by his fruit. O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh. A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things.
(Hom. xlii.) After his former answers He here again refutes them in another manner. This He does not in order to do away their charges against Himself, but desiring to amend them, saying, Either make the tree good and his fruit good, or make the tree corrupt, and his fruit corrupt. As much as to say, None of you has said that it is an evil thing for a man to be delivered from dæmons. But because they did not speak evil of the works, but said that it was the Devil that wrought them, He shews that this charge is contrary to the common sense of things, and human conceptions. And to invent such charges can only proceed from unbounded impudence.