" Once danger becomes its own reward, risk moves from a threat to be avoided to a challenge to be risen toward. An entirely new relationship with fear begins to develop. When risk is a challenge, fear becomes a compass — literally pointing people in the direction they need to go next (i.e., the direction that produces more flow). “If you’re interested in mastery,” says University of Cambridge, England, neuropsychologist Barbara Sahakian, “you have to learn this lesson. To really achieve anything, you have to be able to tolerate and enjoy risk. It has to become a challenge to look forward to. In all fields, to make exceptional discoveries you need risk — you’re just never going to have a breakthrough without it. "

― Steven Kotler , The Rise of Superman: Decoding the Science of Ultimate Human Performance