CHĀNDOGYA UPANISHAD · 6.2.2

कुतस् तु खलु सोम्यैवं स्याद् इति होवाच ।
कथम् असतः सज् जायेत ।
सत् त्व् एव सोम्येदम् अग्र आसीद् एकम् एवाद्वितीयम् ॥

kutas tu khalu somyaivaṃ syād iti hovāca ।
katham asataḥ saj jāyeta ।
sat tv eva somyedam agra āsīd ekam evādvitīyam ॥

'But how could it be thus, my dear?' the father continued. 'How could that which is, be born of that which is not? No, my dear, only that which is, was in the beginning, one only, without a second.

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