This book is about Guru Yoga which is an important practice in Tibetan Buddhism.

"Guru yoga is not just a practice where one visualizes a deity and then makes seven-limbed offerings, but rather it is where one views one’s own root guru as a real buddha from the depths of one’s heart. Having cultivated such an attitude and strong faith, one then engages in actually pleasing the guru by following his advice. It is through such a method that one should try to achieve a transference of the guru’s realizations to one’s own mental continuum. Such a prac- tice is called guru yoga." --Dalai Lama