Badarayana (also known as Vyasa and Krishna Dvaipayana)
"Everybody knows that there are six important systems of thought developed by our ancients known as the Shad Darshanas or the six orthodox schools of philosophy, viz., Sankhya, Yoga, Nyaya, Vaiseshika, Purva Mimamsa and Uttara Mimamsa or Vedanta. Each system has a different shade of opinion. Later, these thoughts became unwieldy, and to regulate them, the Sutras came into existence. Treatises were written in short aphorisms, called "Sutras" in Sanskrit, meaning clues for memory or aids to long discussions on every topic. In the Padma Purana, the definition of a Sutra is given. It says that a Sutra should be concise and unambiguous; but the brevity was carried to such an extent that the Sutra has become unintelligible and particularly so in the Brahma Sutras. Today we find the same Sutra being interpreted in a dozen ways. The Brahma Sutras written by Vyasa or Badarayana—for that was the name which he possessed in addition—are also known as Vedanta Sutras as they deal with Vedanta only. They are divided into four chapters, each chapter being subdivided again into four sections. It is interesting to note that they begin and end with Sutras which read together mean "the inquiry into the real nature of Brahman has no return", meaning that "going by that way one reaches Immortality and no more returns to the world". About the authorship of these Sutras, tradition attributes it to Vyasa. Sankaracharya, in his Bhashya, refers to Vyasa as the author of the Gita and the Mahabharata, and to Badarayana as the author of the Brahma Sutras. His followers—Vachaspathi, Anandagiri and others—identify the two as one and the same person, while Ramanuja and others attribute the authorship of all three to Vyasa himself. The oldest commentary on the Brahma Sutras is by Sankaracharya; he was later followed by Ramanuja, Vallabha, Nimbarka, Madhva and others who established their own schools of thought. All the five Acharyas mostly agree on two points, viz., (i) that Brahman is the cause of this world and (ii) that knowledge of Brahman leads to final emancipation. But they differ amongst themselves on the nature of this Brahman, the relation between the individual soul and the Supreme Soul, and the condition of the soul in the state of release. According to some, Bhakti and not Jnana, as interpreted by Sankara, is the chief means of attaining liberation."
- from "Lives of Saints" by Swami Sivananda
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