Mantra 9

यतश्चोदेति सूर्योऽस्तं यत्र च गच्छति ।तं देवाः सर्वेऽर्पितास्तदु नात्येति कश्चन ॥एतद्वै तत् ॥ ९ ॥

In plain words

That from which the sun rises, and to which it goes when it sets -- on that all the gods are founded, and none whatever ever goes beyond it. This, verily, is That.