TAITTIRĪYA UPANISHAD · 2.4

यतो वाचो निवर्तन्ते । अप्राप्य मनसा सह ।
आनन्दं ब्रह्मणो विद्वान् । न बिभेति कदाचनेति ।
तस्यैष एव शारीर आत्मा । यः पूर्वस्य ।
तस्माद्वा एतस्मान्मनोमयात् । अन्योऽन्तर आत्मा विज्ञानमयः ।
तेनैष पूर्णः । स वा एष पुरुषविध एव ।
तस्य पुरुषविधताम् ।
अन्वयं पुरुषविधः । तस्य श्रद्धैव शिरः ।
ऋतं दक्षिणः पक्षः ।
सत्यमुत्तरः पक्षः । योग आत्मा । महः पुच्छं प्रतिष्ठा ।
तदप्येष श्लोको भवति ।

yato vāco nivartante । aprāpya manasā saha ।
ānandaṃ brahmaṇo vidvān । na bibheti kadācaneti ।
tasyaiṣa eva śārīra ātmā । yaḥ pūrvasya ।
tasmādvā etasmānmanomayāt । anyo’ntara ātmā vijñānamayaḥ ।
tenaiṣa pūrṇaḥ । sa vā eṣa puruṣavidha eva ।
tasya puruṣavidhatām ।
anvayaṃ puruṣavidhaḥ । tasya śraddhaiva śiraḥ ।
ṛtaṃ dakṣiṇaḥ pakṣaḥ ।
satyamuttaraḥ pakṣaḥ । yoga ātmā । mahaḥ pucchaṃ pratiṣṭhā ।
tadapyeṣa śloko bhavati ।

The delight of the Eternal from which words turn away without attaining and the mind also returneth baffled, who knoweth the delight of the Eternal? He shall fear nought now or hereafter. And this Self of Mind is the soul in the body to the former one which was of Prana. Now there is yet a second and inner Self which is other than this which is of Mind and it is made of Knowledge. And the Self of Knowledge filleth the Self of Mind. Now the Knowledge-Self 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. Faith is the head of him, Law is his right side, Truth is his left side; Yoga is his spirit which is the self of him; Mahas (the material world) is his lower member whereon he resteth abidingly. Whereof this is the Scripture.

Sri Aurobindo · CWSA 18, p. 219