  The Buddhist philosophical tradition grew out of earlier efforts to systematize the Buddha’s teachings. Within a century or two of the death of the Buddha, exegetical differences led to debates concerning the Buddha’s true intention on some matter, such as that between the Personalists and others over the status of the person. While the parties to these debates use many of the standard tools and techniques of philosophy, they were still circumscribed by the assumption that the Buddha’s views on the matter at hand are authoritative. In time, however, the discussion widened to include interlocutors representing various Brahmanical systems. Since the latter did not take the Buddha’s word as authoritative, Buddhist thinkers were required to defend their positions in other ways. The resulting debate (which continued for about nine centuries) touched on most of the topics now considered standard in metaphysics, epistemology and philosophy of language, and was characterized by considerable sophistication in philosophical methodology. What the Buddha would have thought of these developments we cannot say with any certainty. What we can say is that many Buddhists have believed that the unfettered exercise of philosophical rationality is quite consistent with his teachings.