The quality of your life is a function of who you go through life with.

Imagine a world of nine billion people with clean water, nutritious food, affordable housing, personalized education, top-tier medical care, and nonpolluting, ubiquitous energy. Building this better world is humanity's grandest challenge.

What is grit? Grit is refusing to give up. It's persistence. It's making your own luck.

My father, who grew up picking olives on the Greek island of Lesbos, was a doctor. So my family expected me to become a physician.

Every generation feels it has the problems that will destroy it. That's because we can perceive them a long time before we have the ability to fix them.

NASA calls stuff nominal instead of phenomenal, like it really is. So I have given up that there is going to be a balance and NASA is going to do certain things and we are finally in a state of existence where small groups of individuals can do extraordinary things, funded by single people.

Creating abundance [is] not about creating a life of luxury for everybody on this planet; it's about creating a life of possibility.