यस्तद्वेद स वेद सर्वं सर्वा दिशो बलिमस्मै हरन्ति सर्वमस्मीत्युपासित तद्व्रतं तद्व्रतम् ॥ २.२१.४ ॥
In plain words
He who knows that knows everything; all the quarters bring him tribute. Let him worship it as "I am all": that is the vow, that is the vow.