CHĀNDOGYA UPANISHAD · 6.8.6

तस्य क्व मूलं स्याद् अन्यत्राद्भ्यः ।
अद्भिः सोम्य शुङ्गेन तेजो मूलम् अन्विच्छ ।
तेजसा सोम्य शुङ्गेन सन्मूलम् अन्विच्छ ।
सन्मूलाः सोम्येमाः सर्वाः प्रजाः सद् आयतनाः सत्प्रतिष्ठाः ।
यथा नु खलु सोम्येमास् तिस्रो देवताः पुरुषं प्राप्य त्रिवृत् त्रिवृद् एकैका भवति तद् उक्तं पुरस्ताद् एव भवति ।
अस्य सोम्य पुरुषस्य प्रयतो वाङ् मनसि संपद्यते मनः प्राणे प्राणस् तेजसि तेजः परस्यां देवतायाम् ॥

tasya kva mūlaṃ syād anyatrādbhyaḥ ।
adbhiḥ somya śuṅgena tejo mūlam anviccha ।
tejasā somya śuṅgena sanmūlam anviccha ।
sanmūlāḥ somyemāḥ sarvāḥ prajāḥ sad āyatanāḥ satpratiṣṭhāḥ ।
yathā nu khalu somyemās tisro devatāḥ puruṣaṃ prāpya trivṛt trivṛd ekaikā bhavati tad uktaṃ purastād eva bhavati ।
asya somya puruṣasya prayato vāṅ manasi saṃpadyate manaḥ prāṇe prāṇas tejasi tejaḥ parasyāṃ devatāyām ॥

'And where could its root be except in water? As water is an offshoot, seek after its root, viz. fire. As fire is an offshoot, seek after its root, viz. the True. Yes, all these creatures, O son, have their root in the True, they dwell in the True, they rest in the True. 'And how these three beings (devatâ), fire, water, earth, O son, when they reach man, become each of them tripartite, has been said before (VI, 4, 7). When a man departs from hence, his speech is merged in his mind, his mind in his breath, his breath in heat (fire), heat in the Highest Being.

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)