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 wrote 'The Blue Sweater' to inspire more people to become engaged in working to solve the problems of global poverty.

People have to understand that unless social enterprise is experimental, it will not succeed in making a difference.

Honour what is most beautiful about the past and build it into the promise of the future.

If you're looking at distributing alternative energy in Nigeria, for instance, what gets in your way is not people's ability to pay, not people's desire for a clean solar lamps or biomass opportunities. But there is a strong status quo that really depends on selling diesel.

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.

Africa can stun you in an instant. It can throw floods and drought and disease at you, sometimes all at the same time. In the next moment, it will tease you with its magnificent beauty, so even if you don't forget, you can find a way to forgive. Ultimately, it keeps you coming back for more.