To prevent complacency, knock yourself off the pedestal once in a while. “You have to disrupt yourself,” Steve Forbes says, “or others will do it for you.”46 If we don’t experience variability in our track record—if we don’t prevent our confidence from inflating after a string of random successes—then a catastrophic failure will do that for us. But catastrophic failures also tend to end your business or your career. “If you’re not humble,” said former world heavyweight champion Mike Tyson, “life will visit humbleness upon you.”