Mahabharata 12.19.26
तपसा महदाप्नोति बुद्ध्या वै विन्दते महत्त्यागेन सुखमाप्नोति सदा कौन्तेय धर्मवित्
tapasā mahadāpnoti buddhyā vai vindate mahattyāgena sukhamāpnoti sadā kaunteya dharmavit
Our plain-language meaning of this verse is waiting for scholar review.
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