In Hebrews 4:12-13, the author concludes the great exhortation begun in 3:7. Do not harden yourself when you hear the Word of God because the Word of God is living and active, it pierces to the deepest part of you, and is able to judge everything about you. This is true because God is the one who speaks this Word. He is the judge of all the earth, whom you cannot escape, and the one to whom you must give an account.