John Calvin's Commentary on the Bible - Matthew 15:19
Verse 19 19.For out of the heart proceed wicked thoughts Hence we infer that the word mouth, as I have mentioned, was used by Christ in a former verse by way of allusion to the context; for now he makes no mention of the mouth, but merely says that out of the heart of man proceeds all that is sinful and that corrupts by its pollution. Mark differs from Matthew in this respect, that he gives a larger catalogue of sins, such as lusts, or irregular desires. The Greek word ( πλεονεξίαι) is by some... read more
Adam Clarke's Commentary on the Bible - Matthew 15:20
These - defile a man - Our Lord's argument is very plain. What goes into the mouth descends into the stomach and other intestines; - part is retained for the nourishment of the body, and part is ejected, as being improper to afford nourishment. Nothing of this kind defiles the soul, because it does not enter into it; but the evil principles that are in it, producing evil thoughts, murders, etc., these defile the soul, because they have their seat and operation in it. read more