Meet the enemy: Your ego. Our guide, Ryan Holiday, wrote one of my favorite books of 2015: The Obstacle Is the Way. Ego Is the Enemy is now one of my favorite books of 2016. It’s fantastic. Big Ideas we explore include: defining ego, becoming more than a flash in the pan, finally answering the question of whether it takes 10,000 or 20,000 hours to attain mastery, the virtue and value of staying true to your own path and making it rather than faking it.