His key point is that the word ‘brahma’ here refers to the supreme reality (not to the brahmin ) and that this brahman is the whole focus of Vedānta, not just a subsidiary part of it. Brahman, as supreme reality, is unequivocally identified as the subject-matter of the Brahmasūtras, the , which they summarize and the system of (Advaita) Vedānta that pursues the enquiry in hand.