Catena Aurea on Matthew 15:15–20: Augustine of Hippo

And the Lord includes herein man’s two mouths, one of the body, one of the heart. For when He says, “Not all that goeth into the mouth defileth a man,” He clearly speaks of the body’s mouth; but in that which follows, He alludes to the mouth of the heart; “But those things which proceed out of the mouth, come forth from the heart, and they defile a man.”