Arthur Anthony Macdonell,
A History of Sanskrit Literature
(1900)
“ As the Upanishads were a development of the speculative side of the Brāhmaṇas and constituted the textbooks of Vedic dogma, so the Çrauta Sūtras form the continuation of their ritual side, though they are not, like the Upanishads, regarded as a part of revelation. A sacred character was never attributed to them, probably because they were felt to be treatises compiled, with the help of oral priestly tradition, from the contents of the Brāhmaṇas solely to meet practical needs. The oldest of them seem to go back to about the time when Buddhism came into being. ”
