Cyril of Alexandria
Catena Aurea · Lukasevangelium 6
For a good tree bringeth not forth corrupt fruit; neither doth a corrupt tree bring forth good fruit. For every tree is known by his own fruit. For of thorns men do not gather figs, nor of a bramble bush gather they grapes. A good man out of the good treasure of his heart bringeth forth that which is good; and an evil man out of the evil treasure of his heart bringeth forth that which is evil: for of the abundance of the heart his mouth speaketh.
But having shewn that the good and the bad man may be discerned by their works as a tree by its fruits, he now sets forth the same thing by another figure, saying, A good man out of the good treasure of his heart bringeth forth that which is good, and the evil man out of the evil treasure bringeth forth that which is evil.