TAITTIRĪYA UPANISHAD · 2.5

विज्ञानं यज्ञं तनुते । कर्माणि तनुतेऽपि च ।
विज्ञानं देवाः सर्वे ।
ब्रह्म ज्येष्ठमुपासते । विज्ञानं ब्रह्म चेद्वेद ।
तस्माच्चेन्न प्रमाद्यति । शरीरे पाप्मनो हित्वा ।
सर्वान्कामान् समश्नुत इति । तस्यैष एव शारीर आत्मा ।
यः पूर्वस्य । तस्माद्वा एतस्माद्विज्ञानमयात् ।
अन्योऽन्तर आत्माऽऽनन्दमयः । तेनैष पूर्णः ।
स वा एष पुरुषविध एव । तस्य पुरुषविधताम् ।
अन्वयं पुरुषविधः । तस्य प्रियमेव शिरः ।
मोदो दक्षिणः पक्षः ।
प्रमोद उत्तरः पक्षः । आनन्द आत्मा । ब्रह्म पुच्छं प्रतिष्ठा ।
तदप्येष श्लोको भवति ।

vijñānaṃ yajñaṃ tanute । karmāṇi tanute’pi ca ।
vijñānaṃ devāḥ sarve ।
brahma jyeṣṭhamupāsate । vijñānaṃ brahma cedveda ।
tasmāccenna pramādyati । śarīre pāpmano hitvā ।
sarvānkāmān samaśnuta iti । tasyaiṣa eva śārīra ātmā ।
yaḥ pūrvasya । tasmādvā etasmādvijñānamayāt ।
anyo’ntara ātmā’’nandamayaḥ । tenaiṣa pūrṇaḥ ।
sa vā eṣa puruṣavidha eva । tasya puruṣavidhatām ।
anvayaṃ puruṣavidhaḥ । tasya priyameva śiraḥ ।
modo dakṣiṇaḥ pakṣaḥ ।
pramoda uttaraḥ pakṣaḥ । ānanda ātmā । brahma pucchaṃ pratiṣṭhā ।
tadapyeṣa śloko bhavati ।

Knowledge spreadeth the feast of sacrifice and knowledge spreadeth also the feast of works; all the gods offer adoration to him as to Brahman and the Elder of the Universe. For if one worship Brahman as the knowledge and if one swerve not from it neither falter, then he casteth sin from him in this body and tasteth all desire. And this Self of Knowledge is the soul in the body to the former one which was of Mind. Now there is yet a second and inner self which is other than this which is of Knowledge and it is fashioned out of Bliss. And the Self of Bliss filleth the Self of Knowledge. Now the Bliss Self is made in the image of a man; according as is the human image of the other, so is it made in the image of the man. Love is the head of Him; Joy is His right side; pleasure is His left side; Bliss is His spirit which is the self of Him; the Eternal is His lower member wherein He resteth abidingly. Whereof this is the Scripture.

Sri Aurobindo · CWSA 18, pp. 219, 220