Brahma Sutra Bhasya of Sankaracharya
Takes perseverance to follow the arguments for and against but well worth it. Yes, one of the pillars of traditional Vedanta wisdom after the Upanishads and the Gita. Feel that it may be useful to read through all the 555 slokas first without the lengthy commentary and then go back ad read relevant commentary for any confusing slokas. Would be a great group practice to slowly study this traditional work.
