Mahabharata 12.64.16

12.64.16

nāsau devo viśvarūpo mayāpi śakyo draṣṭuṃ brahmaṇā vāpi sākṣāt |
ye'nye kāmāstava rājanhṛdisthā dāsyāmi tāṃstvaṃ hi martyeṣu rājā || 16 ||

"Indra said, 'What is your object, O foremost of virtuous persons, in thus seeking to behold that Ancient and First of gods, viz., Narayana, of inconceivable energy, and infinite illusions? Neither myself, nor Brahman himself, can obtain a sight of that god of universal form. I shall grant thee what other objects may be in thy heart, for thou art the foremost of mortals. Thy soul abides in peace; thou art devoted to righteousness; thou hast thy senses under control; and thou art possessed of heroism. Thou seekest unflinchingly to do what is agreeable to the gods. For the sake also of thy intelligence, devotion, and high faith, I shall grant thee whatsoever boons may be desired by thee.'