Four billion people on Earth make less than four dollars a day.

We have to remember that the girls and the women are most isolated and violated and victimized and made invisible in those very societies where our men and our boys feel disempowered, unable to provide.

I've learned that there is no currency like trust and no catalyst like hope. There is nothing worse for building relationships than pandering, on one hand, and preaching, on the other. And the most important quality we must all strengthen in ourselves is that of a deep human empathy, for that will provide the most hope of all and the foundation for our collective survival.

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.

Each of us can work to change a small portion of events. And it's in the total of all those acts that the history of this generation will be written.

We are connected to each other not only as humans, but to every living thing on the planet.

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