A good man out of the good treasure of the heart brings forth good things: and an evil man out of the evil treasure brings forth evil things.
All Commentaries on Matthew 12:35 Go To Matthew 12
Cyril of Alexandria
AD 444
When he says “treasure,” Christ refers to the multitude of motives that lie in the soul. It is not by nature that people are good or bad but by their own choice. He makes this plain in his remark to the Pharisees: It is possible for one and the same person at one time to become good, at another time evil, for “a good man speaks out of the abundance of his heart,” and likewise for the bad.