Book excerpt: Like a spontaneous cascade of wisdom nectar, the open and natural words of Thinley Norbu Rinpoche, uncomplicated by scholarly elaboration, flow here in the tradition of the direct transmissions of Buddhas and Bodhisattvas of the past. Through commentary on the Preliminary Practices (Ngöndrö) prayer from the treasure text of the great master Tragtung Düdjom Lingpa, insights into many central practices emerge in order to deepen understanding of the foundations of Vajrayana Buddhism. Also included in the book is a commentary on Tsok Khang Dechen (Assembly Palace of Great Exaltation), the root text prayer of the second Kyabje Düdjom Rinpoche, Jigdrel Yeshe Dorje.