BṚHADĀRAṆYAKA UPANISHAD · 4.4.13

यस्यानुवित्तः प्रतिबुद्ध आत्मास्मिन् संदेह्ये गहने प्रविष्टः ।
स विश्वकृत् स हि सर्वस्य कर्ता तस्य लोकः स उ लोक एव ॥

yasyānuvittaḥ pratibuddha ātmāsmin saṃdehye gahane praviṣṭaḥ ।
sa viśvakṛt sa hi sarvasya kartā tasya lokaḥ sa u loka eva ॥

'Whoever has found and understood the Self that has entered into this patched-together hiding-place, he indeed is the creator, for he is the maker of everything, his is the world, and he is the world itself.