This book explores willpower, defining it as the capacity to manage attention, feelings, and desires, and highlighting its influence on various life aspects from health to financial stability. It explains how common beliefs about self-control can hinder success, leading to ineffective strategies. The text discusses the neurobiology of self-control, including the prefrontal cortex's role in decision-making and how primitive instincts can either conflict with or aid willpower. It further examines factors that deplete or enhance willpower, such as the impact of stress, sleep deprivation, and immediate gratification, alongside the contagious nature of habits within social networks. Ultimately, the book provides science-backed strategies to improve self-control, emphasizing the importance of understanding the brain's mechanisms and the power of self-compassion in overcoming setbacks.