The threat system is the one that is in greatest use if we feel angry most of the time. Russell explains how compassion can reduce the threat system and increase the soothing system by using scientific mindfulness based techniques. I particularly like the chapter on working compassionately with anger: validation, distress tolerance and exploring our emotional selves. Many people feel bad for feeling angry and this chapter helps to reduce self blame and looks at the valid reasons as to why we are angry. This book can be used as a stand alone self help book or in conjunction with therapy. If you have an interest in how the brain works, evolution and psychology, this book is for you.