Years of working as a psychotherapist showed Philippa Perry what approaches produced positive change in her clients and how best to maintain good mental health. In How to Stay Sane, she has taken these principles and applied them to self-help. Using ideas from neuroscience and sound psychological theory, she shows us how to better understand ourselves. Her idea is that if we know how our minds form and develop, we are less at the mercy of unknown unconscious processes. In this way, we can learn to be the master of our feelings and not their slave.