Mahabharata 12.267.23
इन्द्रियाणां स्वकर्मभ्यः श्रमादुपरमो यदाभवतीन्द्रियसंन्यासादथ स्वपिति वै नरः
indriyāṇāṃ svakarmabhyaḥ śramāduparamo yadābhavatīndriyasaṃnyāsādatha svapiti vai naraḥ
Our plain-language meaning of this verse is waiting for scholar review.
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