Hebrews 4:12-13: "the word of God is living and powerful, and sharper than any two-edged sword, piercing even to the division of soul and spirit, and of joints and marrow, and is a discerner of the thoughts and intents of the heart. 13 And there is no creature hidden from His sight, but all things are naked and open to the eyes of Him to whom we must give account."
The Word of God pierces into our innermost motives, exposing our sin. The Word is a sword, an instrument of death, and we must die for our sin. In union with Christ, we do die, cut apart with Him on the altar. Let the Word do its work, killing the sin in you.