Jimmy Chin is one of the best mountain climbers alive. He knows fear. And how to manage it:
The full quote, from Outside magazine 19 October 2015:
Fear is always there, it’s a survival instinct. You just need to know how to manage it. It’s about sorting out perceived risk from real risk, and then being as rational as possible with what’s left. Am I in control of the situation? Do I possess the skills and capabilities to succeed? If you answer yes to these kinds of questions, go. But if you answer no, have the guts to turn around. Don’t get paralyzed—get rational.