The Brahma Sutras (aka Vedanta Sutras) are a principal Vedanta text composed by Badarayana, who may be viewed as the codifier of the Vedanta school of Indian philosophy. It stands in the third place among the three primary sources for Vedanta teaching, these being: 1. The Upanishads, 2. The Bhagavad Gita, and 3. The Brahma Sutras.
“There were apparent inconsistencies between the various texts of the Upanishads and the Bhagavadgītā, which required to be reconciled and explained away by means of strict reasoning. To reduce, therefore, the teachings of the Upanishads and of the Bhagavadgītā or the Mahābhārata to a consistent and systematic whole, to explain away apparent contradictions in those various texts, and to refute all objections that have been or might be urged against them, it was necessary for Bādarāyaṇa that he should compose a work strictly based on reasoning. He accordingly composed his famous Vedānta Sūtras in four chapters . . .”—T. S. Narayana Sastry, The Age of Sankara, p. 42-47
“In the Brahma-sutra, Badarayana-Vyasa strings together the leading concepts of Vedanta in an ordered manner. The Sutra is an exquisite garland made out of Upanishad blossoms.”—Swami Gambirananda, Brahma Sutra Bhasya of Sankaracharya
Translations
Brahma Sutra by Sarvepalli Radhakrishnan
Brahma Sutra Bhasya of Sankaracharya by Swami Gambirananda
Resources
Brahma Sutra in Sanskrit (IAST)
Selected Articles, Commentaries, etc.
Brahma Sutra Bhasya of Sankaracharya by Swami Gambirananda