Naysayers have little power over us - unless we give it to them.

The average smartphone user checks his or her device every six and a half minutes.

having too much is never enough.

There may be no single thing that can teach us more about life than death.

I come from a Greek household. My mother wouldn't let the FedEx man come in without eating.

My mother was a continual source of wisdom and great advice...she taught me that there is always a way around a problem-you've just got to find it. Keep trying doors; one will eventually open. She also taught me to accept failure as part and parcel of life. It's not the opposite of success; it's an integral part of success. I talk a lot about learning to become fearless in your approach to life. But fearlessness is not the absence of fear. It's the mastery of fear. It's all about getting up one more time than you fall down.

I usually start with a big question, such as whether people today are happier than in the past, or why men have dominated women in most human societies. And then I follow the question instead of trying to follow my own answer, even if it means I can't formulate any clear theory.