SBE 48: The Vedanta-Sutras with commentary by Ramanuja, G...

18. And on account of the declaration of difference. The part of the chapter--beginning with the words 'From that same Self there sprang ether'--which sets forth the nature of the Brahman referred to in the mantra, declares its difference from the individual soul, no less than from the Selfs consisting of food, breath, and mind, viz. in the clause 'different from this which consists of knowledge, is the other inner Self which consists of bliss.'--Through this declaration of difference from the individual soul we know that the Self of bliss referred to in the mantra is other than the individual soul.