For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false witness, slander.
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.
Christ having proved that the disciples, in eating with unwashen hands, were not to be blamed, as transgressing the traditions and injunctions of the elders, comes here to show that they were not to be blamed, as having done any thing that was in itself evil. In the former part of his discourse he overturned the authority of the law, and in this the reason of it. Observe, I.
Commenting on Matthew 15:10-20
For out of the heart proceed evil thoughts,.... Of God, of Christ, of the Spirit, of fellow creatures, and of all sorts of wickedness. The thoughts of sin are evil, are to be hated, forsaken, and for which men are accountable to God.