ŚVETĀŚVATARA UPANISHAD · 2.1

युञ्जानः प्रथमं मनस् तत्वाय सविता धियः ।
अग्नेर् ज्योतिर् निचाय्य पृथिव्या अध्य् आभरत् ॥

yuñjānaḥ prathamaṃ manas tatvāya savitā dhiyaḥ ।
agner jyotir nicāyya pṛthivyā adhy ābharat ॥

Savitri (the sun), having first collected his mind and expanded his thoughts, brought Agni (fire), when he had discovered his light, above the earth.