In today's world, the elites are growing even more comfortable with one another across national lines, yet at the same time, less comfortable with low-income people who share their nationality. How we create those bonds of community that are truly global as well as national is one of our generation's great challenges.

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

Poverty is too complex to be answered with a one-size-fits-all approach, and if there is any place that illustrates that complexity, as well as a better way forward, it is Rwanda.

The time for change is now.

Human beings tend not to spend money on health preventionally. We tend to spend it on top treatment.

Don't let people tell you to do it this way. You are on the verge of figuring out hybrid models -- with companies and nonprofits, markets, government, crowd-sourced philanthropy. The capitalist system as we know it is not working.

When we deny the poor and the vulnerable their own human dignity and capacity for freedom and choice, it becomes self-denial. It becomes a denial of both our collective and individual dignity, at all levels of society.