If there's one value that is immutable, it's integrity or respect, for others and for yourself.

When we were walking through the narrow alleys [of the Mathare Valley slums], it was literally impossible not to step in the raw sewage and the garbage alongside the little homes. But at the same time it was also impossible not to see the human vitality, the aspiration and the ambition of the people who live there.

I've heard it said that the most dangerous animal on the planet is the adolescent male.

It's about all of us, and the kind of world that we, together, want to live in and share.

Every day we have a choice. We can take the easier road, the more cynical road, which is a road sometimes based on a dream of a past that never was, fear of each other, distancing and blame, or we can take the much more difficult path, the road of transformation, transcendence, compassion, and love, but also accountability and justice.

I was going to save the world, and I thought I would start with the African continent.

Our actions - and inaction - touch people every day, people we may never know and never meet.