Maitri (Maitrāyaṇīya) Upaniṣad 6.6

6.6

athāvyāhṛtaṃ vā idamāsīt sa satyaṃ prajāpatistapastaptvā'nuvyāharadbhūrbhuvaḥsvariti |
eṣaivāsya prajāpateḥ sthaviṣṭhā tanuryā lokavatīti svarityasyāḥ śiro nābhirbhuvo bhūḥ pādā ādityaścakṣuḥ cakṣurāyatā hi puruṣasya mahatī mātrā cakṣuṣā hyayaṃ mātrāścarati satyaṃ vai cakṣuḥ akṣiṇyavasthito hi puruṣaḥ sarvārtheṣu carati etasmādbhūrbhuvaḥsvarityupāsītānena hi prajāpatirviśvātmā viśvacakṣurivopāsito bhavatīti evaṃ hyāhaiṣā vai prajāpaterviśvabhṛttanuretasyāmidaṃ sarvamantarhitamasmin ca sarvasminneṣā antarhiteti tasmādeṣopāsītā ||

6. Now [in the beginning], verily, this world was unuttered. When he [the Soul, Ātman], who is the Real (*satya*), who is Prajāpati (Lord of Creation), had performed austerity, he uttered *bhūr* (earth), *bhuvas* (atmosphere), and *svar* (sky).

This, indeed, is Prajāpati's coarsest form, this 'world-form.' Its head is the sky (*svar*). The atmosphere (*bhuvas*) is the navel. The feet are the earth (*bhūr*). The eye is the sun (*āditya*), for a person's great material world (*mātrā*) depends upon the eye, for with the eye he surveys material things. Verily, the eye is the Real; for stationed in the eye a person moves about among all objects.

Therefore one should reverence *bhūr* (earth), *bhuvas* (atmosphere), and *svar* (sky); for thereby Prajāpati, the Soul of all, the eye of all, becomes reverenced, as it were.

For thus has it been said: 'Verily, this is the all-supporting form of Prajāpati. This whole world is hidden in it, and it is hidden in this whole world. Therefore this [is what] one should worship.'