Columbus wouldn’t have made it to the Americas if he had thought he’d never get there or how arduous and dangerous the trip was going to be. Einstein wouldn’t have made it out of the patent office if he had been gloomy and doubtful about his theory. And Robert Oppenheimer would never have been able to ready the A-bomb if…wait a second. I know this is an extreme example, but maybe we’re on to something. Perhaps being positive all the time is not such a good thing?