15. And on account of there being observed in that (small ether), supporting which is a greatness of that (i. e. Brahman).
In continuation of the passage 'It is the Self free from Sin,' &c., which refers to the small ether, the text says: 'it is a bank, a limitary support, that these worlds may not be confounded.' What the text here says about the small ether supporting the world proves it to be the highest Brahman; for to support the world is the glory of Brahman. Compare 'He is the Lord of all, the king of all things, the protector of all things. He is a bank and a boundary, so that these worlds may not be confounded' (Bri. Up. IV, 4, 22); 'By the command of that Imperishable, O Gârgî, heaven and earth stand, held apart' (Bri. Up. III, 8, 9). Now this specific greatness of the highest Brahman, which consists in its supporting the world, is also observed in the small ether--which proves the latter to be none other than Brahman.