TAITTIRĪYA UPANISHAD · 2.6

असन्नेव स भवति । असद्ब्रह्मेति वेद चेत् ।
अस्ति ब्रह्मेति चेद्वेद । सन्तमेनं ततो विदुरिति ।
तस्यैष एव शारीर आत्मा । यः पूर्वस्य ।
अथातोऽनुप्रश्नाः । उताविद्वानमुं लोकं प्रेत्य ।
कश्चन गच्छती३ ।
आहो विद्वानमुं लोकं प्रेत्य । कश्चित्समश्नुता३ उ ।
सोऽकामयत । बहुस्यां प्रजायेयेति । स तपोऽतप्यत ।
स तपस्तप्त्वा । इदंसर्वमसृजत । यदिदं किञ्च ।
तत्सृष्ट्वा । तदेवानुप्राविशत् । तदनु प्रविश्य ।
सच्च त्यच्चाभवत् ।
निरुक्तं चानिरुक्तं च । निलयनं चानिलयनं च ।
विज्ञानं चाविज्ञानं च । सत्यं चानृतं च सत्यमभवत् ।
यदिदं किञ्च । तत्सत्यमित्याचक्षते ।
तदप्येष श्लोको भवति ।

asanneva sa bhavati । asadbrahmeti veda cet ।
asti brahmeti cedveda । santamenaṃ tato viduriti ।
tasyaiṣa eva śārīra ātmā । yaḥ pūrvasya ।
athāto’nupraśnāḥ । utāvidvānamuṃ lokaṃ pretya ।
kaścana gacchatī3 ।
āho vidvānamuṃ lokaṃ pretya । kaścitsamaśnutā3 u ।
so’kāmayata । bahusyāṃ prajāyeyeti । sa tapo’tapyata ।
sa tapastaptvā । idaṃsarvamasṛjata । yadidaṃ kiñca ।
tatsṛṣṭvā । tadevānuprāviśat । tadanu praviśya ।
sacca tyaccābhavat ।
niruktaṃ cāniruktaṃ ca । nilayanaṃ cānilayanaṃ ca ।
vijñānaṃ cāvijñānaṃ ca । satyaṃ cānṛtaṃ ca satyamabhavat ।
yadidaṃ kiñca । tatsatyamityācakṣate ।
tadapyeṣa śloko bhavati ।

One becometh as the unexisting, if he know the Eternal as negation; but if one knoweth of the Eternal that He is, then men know him for the saint & the one reality. And this Self of Bliss is the soul in the body to the former one which was of Knowledge. And thereupon there arise these questions. “When one who hath not the Knowledge, passeth over to that other world, doth any such travel farther? Or when one who knoweth, hath passed over to the other world, doth any such enjoy possession?” The Spirit desired of old “I would be manifold for the birth of peoples.” Therefore He concentrated all Himself in thought, and by the force of His brooding He created all this universe, yea all whatsoever existeth. Now when He had brought it forth, He entered into that He had created, He entering in became the Is here and the May Be there; He became that which is defined and that which hath no feature; He became this house` d thing and that houseless; He became Knowledge and He became Ignorance; He became Truth and He became falsehood. Yea He became all truth, even whatsoever here existeth. Therefore they say of Him that He is Truth. Whereof this is the Scripture.

Sri Aurobindo · CWSA 18, pp. 220, 221