RELIGION & BELIEFS. In "The Mirror of Mindfulness, " seventeenth-century master Tsele Natsok Rangdrol teaches that there is an identical essence intrinsic to the heart, mind, and spirit in every human being. The realization of this essential oneness in humanity, he said, makes any man or woman a Buddha. The book focuses on how to reach this understanding through a system of training of timeless, universal value that has been developed in Tibet. According to editor Erik Pema Kunsang Schmidt, the truth such training conveys is as meaningful for a modern meditation practitioner as it was centuries ago for Buddhists in India and Tibet. Newly designed and with a new translation of the Final Words of Tsele Natsok Rangdrol, this book is the foundation for the often-cited commentary "Bardo Guidebook" by contemporary teacher Chokyi Nyima Rinpoche and is widely seen as indispensable for the serious study of Tibetan Buddhism.