The Ratnāvalī by Nāgārjuna was well known from the numerous quotations scattered in the Mahāyāna literature in India as well as in Tibet, but no manuscript of it was up to now available. Fortunately, Nepal, which has yielded so many treasures of ancient Indian literature, has recently rendered back to light a large fragment of this work, the importance of which cannot be overlooked by scholars. Nāgārjuna was certainly one of the greatest thinkers ever born in India, and whatever was written by him deserves our greatest attention. His thought has permeated, as it were, not only the Abhidharma of Mahāyāna, but also the mystical experiences of the Tantric systems. Therefore we must welcome anything written by him, because it will help our understanding of Buddhist, and therefore of Indian, mind.