The present work contains Nāgārjuna’s verses on the Middle Way (Skt. Madhyamaka, Tib. dBu ma), accompanied by Mabja Jangchub Tsöndrü’s famed commentary, the Ornament of Reason. Active in the twelfth century, Mabja was among the first Tibetans to rely on the works of the Indian master Candrakīrti, and his account of the Middle Way exercised a deep and lasting influence on the development of Madhyamaka philosophy in all four schools of Buddhism in Tibet. Sharp, concise, and yet comprehensive, the Ornament of Reason has been cherished by generations of scholar-practitioners. The late Khunu Lama Tenzin Gyaltsen Rinpoche, a renowned authority on the subject, often referred to this commentary as “the best there is.”