Rock stars are good at making noise.

The job of art is to chase ugliness away.

The great music for so many artists - the Beatles, the Rolling Stones - was always at the moment when they were closest to pop. It would be easy for U2 to go off and have a concept album, but I want us to stay in the pop fray.

Africa is a continent in flames. And deep down, if we really accepted that Africans were equal to us, we would all do more to put the fire out. We're standing around with watering cans, when what we really need is the fire brigade.

Ethiopia didn't just blow my mind; it opened my mind. Anyway, on our last day at this orphanage a man handed me his baby and said, 'Would you take my son with you?' He knew, in Ireland, that his son would live, and that in Ethiopia, his son would die.

Poverty breeds despair. We know this. Despair breeds violence. We know this. In turbulent times, isn't it cheaper, and smarter, to make friends out of potential enemies than to defend yourself against them later?

You don't become an 'artist' unless you've got something missing somewhere. Blaise Pascal called it a God-shaped hole. Everyone's got one but some are blacker and wider than others. It's a feeling of being abandoned,cut adrift in space and time-sometimes following the loss of a loved one. You can never completely fill that hole-you can try with songs,family,faith and by living a full life...but when things are silent, you can still hear the hissing of what's missing.