This book features a text by the first Dodrupchen that has become the main preliminary practices text for Longchen Nyingthig practitioners.  Several other texts by Tibetan Longchen Nyingthig masters are included so that the reader can have the clearest possible understanding of the practice text and how to use it for practice.  There is also a commentary by Lama Tony Duff that clarifies points not contained in the other commentaries.  Introduction, translations, commentary, ample footnotes, glossary, and book design by Tony Duff.