" The first is to push yourself harder than you believe you’re capable of. You’ll find new depth inside yourself. The second is to put yourself in groups who share difficulties, discomfort. We used to call it ‘shared privation.’ You’ll find that when you have been through that kind of difficult environment, that you feel more strongly about that which you’re committed to. And finally, create some fear and make individuals overcome it. "

― Timothy Ferriss , Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-Class Performers