Rāmānujaon Brahma Sūtra 1.2.29

The teacher Âsmarathya is of opinion that the text represents the highest Self as possessing a definite extent, to the end of rendering the thought of the meditating devotee more definite. That is to say—the limitation due to the limited extent of heaven, sun, &c. has the purpose of rendering definite to thought him who pervades (abhi) all this Universe and in reality transcends all measure (vimâna).—A further difficulty remains. For what purpose is the highest Brahman here represented like a man, having a head and limbs?—This point the next Sûtra elucidates.