In Mark 7:9-23, Jesus challenges the religious leaders’ emphasis on human traditions over God’s commandments. He teaches that what truly defiles a person comes not from external impurities but from the evil intentions within one’s heart. Jesus lists examples of sins such as theft, greed, deceit, envy, slander, pride, and foolishness, indicating these are the real issues that separate people from God. This passage emphasizes the importance of focusing on internal purity and spiritual integrity rather than outward religious appearances.