And if they should say to him: 'Now with regard to that city of Brahman, and the palace in it, i. e. the small lotus of the heart, and the small ether within the heart, what is there within it that deserves to be sought for, or that is to be understood?'

In plain words: The teacher imagines students asking a question: in this body-city, with the heart and the tiny space inside it, what could be there that is worth looking for and understanding?