Meaning of ""40"" by U2

The lyrics of "40" are inspired by Psalm 40 from the Bible, specifically verses 1-3 which talk about waiting for the Lord, being heard, and being lifted out of a slimy pit. The repetition of "How long to sing this song?" reflects the longing for deliverance and the need for continuous faith and perseverance. The mention of singing a new song represents a fresh start, gratefulness, and the desire to praise God despite the challenges faced. The reference to setting feet upon a rock and firm footsteps can symbolize stability and strength found through faith. Overall, the song conveys themes of trust, hope, and the transformative power of spirituality.