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
Theophylact of Ochrid
AD 1107
When you see a speaker of obscenities, know that he does not have in his heart the same quantity of evil that he speaks, but many times more. For it is the excess that spills over, and he who has a hidden treasure displays only a small part. Likewise he who speaks good has even more in his heart.