15 There is nothing from outside of the man, that going into him can defile him; but the things which proceed out of the man are those that defile the man.

Matthew Henry's Commentary on Mark 7:15

Commentary on Mark 7:14-23

(Read Mark 7:14-23)

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.