ŚVETĀŚVATARA UPANISHAD · 2.4

युञ्जते मन उत युञ्जते धियो विप्रा विप्रस्य बृहतो विपश्चितः ।
वि होत्रा दधे वयुनाविद् एक इन् मही देवस्य सवितुः परिष्टुतिः ॥

yuñjate mana uta yuñjate dhiyo viprā viprasya bṛhato vipaścitaḥ ।
vi hotrā dadhe vayunāvid eka in mahī devasya savituḥ pariṣṭutiḥ ॥

The wise sages of the great sage collect their mind and collect their thoughts. He who alone knows the law (Savitri) has ordered the invocations; great is the praise of the divine Savitri.

F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)