The word 'sat', a name of Brahman, is used in the sense of real existence, that is, of bringing a thing into being where it did not exist, as one speaks of the birth of a son who was not there before; and it is used in the sense of becoming good, when one who behaved badly turns to good conduct. And, Partha, the word 'sat' is likewise used in connection with an auspicious act, such as a marriage.
Contemporary English rendering of the Sanskrit bhāṣya, pending scholar review.