The Mahayana movement was emerging as a vigorous and self-conscious intellectual force, while the earlier traditions of the eighteen “schools” (nikaya) resisted the authority of the Mahayana and continued to elaborate the fundamental concepts of Buddhist thought. Bhāviveka’s “Verses on the Heart of the Middle Way” (Madhyamakahrdayakārikā) with their commentary, known as “The Flame of Reason” (Tarkajvālā), give a unique and authoritative account of the intellectual differences that stirred the Buddhist community in this creative period. Bhāviveka and His Buddhist Opponents gives a clear and accessible translation of Chapters 4 and 5 of this text: the chapters on the Śrāvakas, or eighteen schools, and the Yogācāra, Bhāviveka’s most important Mahayana opponents.