Lyric discussion by AgentGabbit 

BrandtH, they didn't write the song. David wrote it about 4000 years ago. So I doubt it has much to do with Ireland...

Agent, David probably didn't write the psalm either. In fact, David is only given straight authorship of around a 1/3 of the psalms. This is a song written in the era of King David, in the school of thought and theology that was that time.

I do think Brandth has a point, because U2 places this at the end of an anti-war album. What is bono saying? I don't think he is pointing out inconsistencies in religion or spirituality, I think he is genuinely asking God how long must we sing until all those wars will stop.

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