Mahabharata 3.176.26

3.176.26

yasmādabhāvī bhāvī vā manuṣyaḥ sukhaduḥkhayoḥ |
āgame yadi vāpāye na tatra glapayenmanaḥ || 26 ||

As I was falling rapidly from Sakra's throne placed on the front of his palace, I spake unto that worshipful sage (Agastya), 'Do thou free me from this curse.' Thereat filled with compassion, that energetic one said unto me, 'O king, thou shall be freed after the lapse of some time.' Then I fell to the earth (as a snake); but my recollection (of former life) did not renounce me. And although it be so ancient, I still recollect all that was said. And the sage said unto me, That person who conversant with the relation subsisting between the soul and the Supreme Being, shall be able to answer the questions put by thee, shall deliver thee. And, O king, taken by thee, strong beings superior to thee, shall immediately lose their strength, I heard these words of those compassionate ones, who felt attached unto me. And then the Brahmanas vanished. Thus, O highly effulgent one, having become a serpent, I, doing exceedingly sinful acts, live in unclean hell, in expectation of the (appointed) time.' The mighty-armed Bhimasena addressed the serpent, saying, 'I am not angry, O mighty snake,--nor do I blame myself. Since in regard to happiness and misery, men sometimes possess the power of bringing and dismissing them, and sometimes do not. Therefore one should not fret one's mind. Who can baffle destiny by self-exertion? I deem destiny to be supreme, and self-exertion to be of no avail.