KENA UPANISHAD · 3/6

तस्मै तृणं निदधावेतद्दहेति तदुपप्रेयाय सर्वजवेन तन्न शशाक दग्धुं
स तत एव निववृते नैतदशकं विज्ञातुं यदेतद्यक्षमिति ॥

tasmai tṛṇaṃ nidadhāvetaddaheti tadupapreyāya sarvajavena tanna śaśāka dagdhuṃ
sa tata eva nivavṛte naitadaśakaṃ vijñātuṃ yadetadyakṣamiti ॥

The Eternal set before him a blade of grass; “This burn;” and he made towards it with all his speed, but could not burn it. There he ceased, and turned back; “I could not know of It, what might be this mighty Daemon.”