In 1983, U2 ran out of studio time and needed one more song to finish an album, so Bono opened his Bible to Psalm 40 and turned it into lyrics on the spot—it became one of rock's most iconic sing-along moments, with crowds still chanting the refrain long after the band left the stage. So what should our songs actually be about? Not vague spirituality, not our own feelings, and not moral self-improvement, but the real good news of Jesus Christ. Psalm 40 points to 3 aspects of our salvation worth singing about: what Jesus has already done for us, what he's doing in us right now, and what he will do when he returns.