Mahabharata 12.179.2

यद्यूष्मभाव आग्नेयो वह्निना पच्यते यदिअग्निर्जरयते चैव तस्माज्जीवो निरर्थकः

yadyūṣmabhāva āgneyo vahninā pacyate yadiagnirjarayate caiva tasmājjīvo nirarthakaḥ

Our plain-language meaning of this verse is waiting for scholar review.