This book is based on the teaching discourse given by Kyabje Yongdzin Lopon Tenzin Namdak Rinpoche on The Four Wheels of Bon. Found in version Zijyi, the long biography of Tonpa Shenrab Miwoche, the Buddha of Yungdrung Bon. This discourse combines the oral translation of the original text with the direct instructions coming from the mind of the Teacher of Teachers - Yongdzin Rinpoche, the most illustrious and erudite Bonpo master and scholar of our times. Since the teachings contained in this volume form the very foundation for the practice and study of Yungdrung Bon, this text will bring benefit to all, from those who are just beginning to take an interest in this most ancient and authentic spiritual tradition to those who have already been studying and practising for many years, as well as to academicians and Bonpo scholars."