CHĀNDOGYA UPANISHAD · 3.18.5

चक्षुर् एव ब्रह्मणश् चतुर्थः पादः ।
स आदित्येन ज्योतिषा भाति च तपति च ।
भाति च तपति च कीर्त्या यशसा ब्रह्मवर्चसेन य एवं वेद ॥

cakṣur eva brahmaṇaś caturthaḥ pādaḥ ।
sa ādityena jyotiṣā bhāti ca tapati ca ।
bhāti ca tapati ca kīrtyā yaśasā brahmavarcasena ya evaṃ veda ॥

The eye is indeed the fourth foot of Brahman. That foot shines with Âditya (sun) as its light, and warms. He who knows this, shines and warms through his celebrity, fame, and glory of countenance.

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