Mbh 3.257.2a

“After a little while, that mighty ascetic, Vyasa, the son of Satyavati, came there to see the Pandavas. And seeing him approach, Kunti’s son, Yudhishthira, stepped forward, and duly received that high-souled one. And having gratified Vyasa by bowing down unto him, Pandu’s son of subdued senses, after the Rishi had been seated, sat down before him, desirous of listening to him. And beholding his grandsons lean and living in the forest on the produce of the wilderness, that mighty sage, moved by compassion, said these words, in accents choked in tears, ‘O mighty-armed Yudhishthira, O thou best of virtuous persons, those men that do not perform ascetic austerities never attain great happiness in this world. People experience happiness and misery by turns; for surely, O bull among men, no man ever enjoyeth unbroken happiness. A wise man endued with high wisdom, knowing that life hath its ups and downs, is neither filled with joy nor with grief. When happiness cometh, one should enjoy it; when misery cometh, one should bear it, as a sower of crops must bide his season. Nothing is superior to asceticism: by asceticism one acquireth mighty fruit. Do thou know, O Bharata, that there is nothing that asceticism cannot achieve. Truth, sincerity, freedom from anger, justice, self-control, restraint of the faculties, immunity from malice, guilelessness, sanctity, and mortification of the senses, these, O mighty monarch, purify a person of meritorious acts. Foolish persons addicted to vice and bestial ways, attain to brutish births in after life and never enjoy happiness. The fruit of acts done in this world is reaped in the next. Therefore should one restrain his body by asceticism and the observance of vows. And, O king, free from guile and with a cheerful spirit, one should, according to his power, bestow gifts, after going down to the recipient and paying him homage. A truth-telling person attaineth a life devoid of trouble.