Bhagavad Gita 8.9
Whoso meditates on the Omniscient, the Ancient, more minute than an atom, yet the Ruler and Upholder of all, Unimaginable, Brilliant like the Sun, Beyond the reach of darkness;
कविं पुराणमनुशासितार
मणोरणीयांसमनुस्मरेद्यः।
सर्वस्य धातारमचिन्त्यरूप
मादित्यवर्णं तमसः परस्तात्॥kaviṃ purāṇamanuśāsitāra
maṇoraṇīyāṃsamanusmaredyaḥ|
sarvasya dhātāramacintyarūpa
mādityavarṇaṃ tamasaḥ parastāt||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).