When people reflexively write checks to institutions that have billions of dollars in the bank, they are essentially committing a moral crime. Your money could do good in this world and you're choosing instead to waste it. People have to do a better job of that. You've got to find places where your money's going to do some good and direct your dollars towards that institution.

Six degrees of separation doesn't mean that everyone is linked to everyone else in just six steps. It means that a very small number of people are linked to everyone else in a few steps, and the rest of us are linked to the world through those special few.

The answer is that the success of any kind of social epidemic is heavily dependent on the involvement of people with a particular and rare set of social gifts.

I'm a purist: I start to wrinkle my nose when the Cold War ends.

My highest compliment is when someone comes up to me to say, "My 14-year-old daughter, or my 12-year-old son read your book and loved it." I cannot conceive of a greater compliment than that - to write something that as an adult I find satisfying, but also that manages to reach a curious 13- or 14-year-old.

I interviewed one of the most powerful lawyers in the world and he told me, "At the time, it was the worst thing in the world not to be able to get a job at a fancy law firm, but it's the greatest thing that ever happened in my life." It was a humble acknowledgment of how forces much larger than himself shaped his career. I really wanted to bring that point home.

[Research] suggests that what we think of as free will is largely an illusion: much of the time, we are simply operating on automatic pilot, and the way we think and act – and how well we think and act on the spur of the moment – are a lot more susceptible to outside influences than we realize.