Vajra Wisdom presents the commentaries of two great nineteenth-century Nyingma masters that guide practitioners engaged in development stage practice through a series of straightforward instructions. The rarity of this kind of material in English makes it indispensable for practitioners and scholars alike. The goal of development stage meditation in the Tibetan Buddhist tradition is to directly realize the inseparability of phenomena and emptiness. Preceded by initiation and oral instructions, the practitioner arrives at this view through the profound methods of deity visualization, mantra recitation, and meditative absorption.