This hymn expresses confidence in God as a mighty fortress and helper against the forces of evil in the world. It describes how without God's strength and choosing of Jesus Christ as the right man on our side, humanity would be doomed to fail in its struggles. It asserts that even though the world is filled with devils threatening to undo believers, Christians will not fear as God will ensure His truth triumphs through them. The final verse declares that no earthly power can overcome God's word and spirit, which are eternal.