"We don't actually know what a positive or negative experience is. Some of the most difficult and stressful moments of our lives also end up being the most formative and motivating. Some of the best and most gratifying experiences of our lives are also the most distracting and demotivating. Don't trust your conception of positive/negative experiences. All that we know for certain is what hurts in the moment and what doesn't. And that's not worth much."