Mahabharata 3.37.36

युधिष्ठिरस्तु धर्मात्मा तद्ब्रह्म मनसा यतःधारयामास मेधावी काले काले समभ्यसन्

yudhiṣṭhirastu dharmātmā tadbrahma manasā yataḥdhārayāmāsa medhāvī kāle kāle samabhyasan

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