These marks may also refer to Akasa as the scriptures say from the Akasa sprang air, from air fire, and so on and they return to the Akasa at the end of a cycle . But the sentence All these beings take their origin from the Akasa only clearly indicates the highest Brahman, as all Vedanta-texts agree in proclaiming definitely that all beings take their origin from the Highest Brahman. But the Purvapakshin or the opponent may say that the elemental Akasa also may be taken as the cause viz., of air, fire and the other elements. But then the force of the words all these and only in the text quoted would be lost. To keep it, the text should be taken to refer to the fundamental cause of all, including Akasa also, which is Brahman alone.
Brahman alone can be greater than all and their ultimate goal as mentioned in the text.
Brahman is Knowledge and Bliss. He is the Ultimate Goal of him who makes gifts Bri. The text says that all things have been born from Akasa. Such a causation can apply only to Brahman. The text says that Akasa is greater than everything else, that Akasa is the Supreme Goal and that it is Infinite.