When he had called all the people - But instead of παντα, all, παλιν, again, is the reading of BDL, later Syriac in the margin, Coptic, Ethiopic, Saxon, Vulgate, all the Itala but one. Mill and Griesbach approve of this reading.

And when he, had called all the people unto him,.... The Vulgate Latin, and Ethiopic versions, instead of "all", read again, and so do some copies: having said what was sufficient to stop the mouths of the Scribes and Pharisees, about their unwarrantable traditions; he turns himself to the common people, who stood at some distance, because of these venerable doctors, and called to them to come nearer to him:
he said unto them, hearken to me every one of you, and understand; signifying, he had something of moment to say to them, which they would do well to attend unto, and what they should be desirous of understanding aright, it being what concerned every one of them; See Gill on Matthew 15:10.

Our wicked thoughts and affections, words and actions, defile us, and these only. As a corrupt fountain sends forth corrupt streams, so does a corrupt heart send forth corrupt reasonings, corrupt appetites and passions, and all the wicked words and actions that come from them. A spiritual understanding of the law of God, and a sense of the evil of sin, will cause a man to seek for the grace of the Holy Spirit, to keep down the evil thoughts and affections that work within.