The Yaksha asked,—‘What hath been said to be the sign of asceticism? And what is true restraint? What constitutes forgiveness. And what is shame?’ Yudhishthira answered,—‘Staying in one’s own religion is asceticism: the restraint of the mind is of all restraints the true one: forgiveness consists in enduring enmity; and shame, in withdrawing from all unworthy acts.’

In plain words: Yudhishthira says true self-discipline is staying faithful to your own religious duty, the real restraint is control of the mind, forgiveness means putting up with others' hostility, and shame means staying away from wrong actions.