Mahabharata 12.280.3

आयुर्नसुलभं लब्ध्वा नावकर्षेद्विशां पतेउत्कर्षार्थं प्रयतते नरः पुण्येन कर्मणा

āyurnasulabhaṃ labdhvā nāvakarṣedviśāṃ pateutkarṣārthaṃ prayatate naraḥ puṇyena karmaṇā

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