TAITTIRĪYA UPANISHAD · 2.3
प्राणं देवा अनु प्राणन्ति । मनुष्याः पशवश्च ये ।
प्राणो हि भूतानामायुः । तस्मात् सर्वायुषमुच्यते ।
सर्वमेव त आयुर्यन्ति । ये प्राणं ब्रह्मोपासते ।
प्राणो हि भूतानामायुः । तस्मात् सर्वायुषमुच्यत इति ।
तस्यैष एव शारीर आत्मा । यः पूर्वस्य ।
तस्माद्वा एतस्मात् प्राणमयात् । अन्योऽन्तर आत्मा मनोमयः ।
तेनैष पूर्णः । स वा एष पुरुषविध एव ।
तस्य पुरुषविधताम् । अन्वयं पुरुषविधः ।
तस्य यजुरेव शिरः । ऋग्दक्षिणः पक्षः । सामोत्तरः पक्षः ।
आदेश आत्मा । अथर्वाङ्गिरसः पुच्छं प्रतिष्ठा ।
तदप्येष श्लोको भवति ।
prāṇaṃ devā anu prāṇanti । manuṣyāḥ paśavaśca ye ।
prāṇo hi bhūtānāmāyuḥ । tasmāt sarvāyuṣamucyate ।
sarvameva ta āyuryanti । ye prāṇaṃ brahmopāsate ।
prāṇo hi bhūtānāmāyuḥ । tasmāt sarvāyuṣamucyata iti ।
tasyaiṣa eva śārīra ātmā । yaḥ pūrvasya ।
tasmādvā etasmāt prāṇamayāt । anyo’ntara ātmā manomayaḥ ।
tenaiṣa pūrṇaḥ । sa vā eṣa puruṣavidha eva ।
tasya puruṣavidhatām । anvayaṃ puruṣavidhaḥ ।
tasya yajureva śiraḥ । ṛgdakṣiṇaḥ pakṣaḥ । sāmottaraḥ pakṣaḥ ।
ādeśa ātmā । atharvāṅgirasaḥ pucchaṃ pratiṣṭhā ।
tadapyeṣa śloko bhavati ।
The Gods live and breathe under the dominion of Prana and men and all these that are beasts; for Prana is the life of created things & therefore they name it the Life-Stuff of the All. Verily they who worship the Eternal as Prana attain mastery of Life to the uttermost; for Prana is the life of created things and therefore they name it the Life-Stuff of the All. And this Self of Prana is the soul in the body of the former one which was of food. Now there is yet a second and inner Self which is other than this that is of Prana, and it is made of Mind. And the Self of Mind filleth the Self of Prana. Now the Self of Mind is made in the image of a man; according as is the human image of the other, so is it in the image of the man. Yajur is the head of him and the Rigveda is his right side and the Samaveda is his left side: the Commandment is his spirit which is the self of him, Atharvan Ungirus is his lower member whereon he resteth abidingly. Whereof this is the Scripture.
Sri Aurobindo · CWSA 18, p. 218