Early Buddhist Theory of Knowledge c6.3

c6.3

(2) The intense speculative interest, which is so evident in the tenth book (maṇḍala) of the Ṛgveda persists as an undercurrent in the period of the Brāhmaṇas and issues forth in the theories and intuitions of the Upaniṣads, whether we consider them a linear development in Vedic thought or as being due to the impact of an external element Aryan or non-Aryan. Contemporaneous with the Middle³ or Late Upaniṣads or perhaps even later, we find the existence *v infra*, 147, 158) and the epistemological and logical theories peculiar to Materialism, Ājīvikism, Jainism and Buddhism.