The real metric of success isn't the size of your bank account. It's the number of lives in whom you might be able to make a positive difference.

Each one of us has the power to be the change we want to see in the world, making the world a better place.

Humans have always used our intelligence and creativity to improve our existence. After all, we invented the wheel, discovered how to make fire, invented the printing press and found a vaccine for polio.

I believe our legacy will be defined by the accomplishments and fearless nature by which our daughters and sons take on the global challenges we face. I also wonder if perhaps the most lasting expression of one's humility lies in our ability to foster and mentor our children.

I understand human needs. I grew up where far too many people lived day to day without elemental needs like food and shelter.

Athletes at all ages are bigger and stronger than ever before. And they are being encouraged - sometimes even incentivized, as we recently learned was the case on at least one National Football League team - to play to injure.

Philanthropy without scale and sustainability is like any other bad business that will simply wither and die on the vine.