it became Psalm 18, Israel’s song or prayer. Luther wrote that the Psalter ‘is interwoven with the Our Father [the Lord’s Prayer] in such a way that we can understand each through the other very well and see their happy harmony.’ The New Covenant people of God continued to use the Psalms. A Spirit-filled church will speak ‘to one another with psalms, hymns and songs from the Spirit’ (Eph. 5:19); we are probably not to understand these as three different categories, so that something is either a Psalm