He calls people to listen to him and explains that "Nothing outside a man can make him 'unclean' by going into him. Rather, it is what comes out of a man that makes him 'unclean.'" (15) Later his disciples (students) tell him they didn't understand him and he scolds them for being "dull". He explains to them that food cannot make a person unclean but "What comes out of a man is what makes him 'unclean.' For from within, out of men's hearts, come evil thoughts, sexual immorality, theft, murder, adultery, greed, malice, deceit, lewdness, envy, slander, arrogance and folly. All these evils come from inside and make a man 'unclean.'" (20-23) meaning intention of the "heart" is more important than ritual. What foods you eat will not matter to God.