“Not only do you not do your best work in the “dangerously over-challenged” range, but if you stay in this range for very long, something in your life will break. I don’t care how resilient you are, how much energy you naturally possess, or how much mental toughness you think you have; something will break. You will not be exempt from this law. Your health, marriage, connection with your kids, relationship with God, emotional well-being – something is going to crack.”
