With all singers, insecurity is your best security. That's why we're such loud people and why we walk all funny. You think, 'Are people interested?' But I think our band has something and they know we don't just put albums out. We do think about it.

It's much easier to be successful than it is to be relevant. The tricks won't keep you relevant. Tricks might keep you popular for a while, but in all honesty, I don't know how U2 will stay relevant. I know we've got a future. I know we can fill stadiums. And yet with every record, I think, 'Is this it? Are we still relevant?'

When you align yourself with God's purpose as described in the Scriptures, something special happens to your life.

To be one, to be united is a great thing. But to respect the right to be different is maybe even greater.

Mandela's heroism is the heroism of a man who suffered so badly for what he thought of as freedom. And yet when he had the upper hand he has this incredible self-control and these incredible leadership qualities.

It's a privilege to serve the poor, to be servants of noble Africans, but I better belong in the rehearsal room or in the studio with my band. That's where I want to be and I still wake up in the morning with melodies in my head.