Vedanta
Brahma Sutras (completed in the 5th century)

Badarayana summarized and interpreted teachings of the Upanishads in the Brahma Sutras, also called the Vedanta Sutra, possibly "written from a Bhedābheda Vedāntic viewpoint." Badarayana summarized the teachings of the classical Upanishads and refuted the rival philosophical schools in ancient India like the sāṃkhya system. The Brahma Sutras laid the basis for the development of Vedanta philosophy.

Though attributed to Badarayana, the Brahma Sutras were likely composed by multiple authors over the course of hundreds of years. The estimates on when the Brahma Sutras were complete vary, with Nakamura in 1989 and Nicholson in his 2013 review stating, that they were most likely compiled in the present form around 400–450 CE. Isaeva suggests they were complete and in current form by 200 CE, while Nakamura states that "the great part of the Sutra must have been in existence much earlier than that" (800 - 500 BCE).

The book is composed of four chapters, each divided into four-quarters or sections. These sutras attempt to synthesize the diverse teachings of the Upanishads. However, the cryptic nature of aphorisms of the Brahma Sutras have required exegetical commentaries. These commentaries have resulted in the formation of numerous Vedanta schools, each interpreting the texts in its own way and producing its own commentary.
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