55:12–13 See 35:1–2, 6–10. Salvation is a journey: we walk with the Lord to the accompaniment of joyous song. Ultimately, nature will also benefit from God’s salvation of Adam and Eve’s children. 56:1–66:24 Righteousness: The Character of Servanthood. This last division of the book, especially its central unit (60:1–62:12), reveals the completion of Israel’s mission to be a light to the nations (just as Isaiah’s declaration of God’s word to the nation fulfilled his experience of revelation