How do we know that God's Word is powerful?

The sermon emphasizes that God's Word is His power, capable of penetrating the hardest hearts and bringing life to the spiritually dead. In Jeremiah 23:29, God likens His Word to a fire and a hammer that breaks the rock in pieces. This imagery reflects the Word's ability to accomplish God's purposes, as stated in Isaiah 55:11, which assures that God's Word shall not return void. Preachers are called to faithfully proclaim this Word, as it alone carries the transformative power necessary for salvation.