7:20 What comes out of a person. Jesus is generalizing about the natural and constant way in which fallen human nature expresses itself, and His list of vices (vv. 21, 22) is meant to bring horrifying self-knowledge (cf. Rom. 1:24–32; 2:17–24).
defiles. Jesus goes to the essence of the matter—uncleanness of the heart, of which ceremonial uncleanness is really a symbol.