The author urges us to listen to God's voice, as mentioned in Hebrews 3:7, 15, and 4:7, quoting Psalm 95:7. They describe God's word as alive and powerful, meaning it is an active and effective force. The word that created and controls the universe (Hebrews 1:2–3) can also strongly influence people. It is like the sharpest two-edged sword, able to reach the deepest parts of people's lives and reveal their thoughts and desires (see Ephesians 6:17; Revelation 1:16; 2:12, 16; 19:15).