Mahabharata 3.33.35

3.33.35

tridvārāmarthasiddhiṃ tu nānupaśyanti ye narāḥ |
tathaivānarthasiddhiṃ ca yathā lokāstathaiva te || 35 ||

They, therefore, that regard the three alone (mentioned above) as the doors of all success and failure in the world, (without regarding the acts of former life), are dull and inert like the body itself. For all this, however, a person should act. This is the conclusion of Manu himself. The person that doth not act, certainly succumbeth, O Yudhishthira. The man of action in this world generally meeteth with success. The idle, however, never achieveth success. If success, becometh impossible, then should one seek to remove the difficulties that bar his way to success. And, O king, if a person worketh (hard), his debt (to the gods) is cancelled (whether he achieveth success or not). The person that is idle and lieth at his length, is overcome by adversity; while he that is active and skillful is sure to reap success and enjoy prosperity. Intelligent persons engaged in acts with confidence in themselves regard all who are diffident as doubting and unsuccessful. The confident and faithful, however, are regarded by them as successful. And this moment misery hath overtaken us. If, however, thou betakest to action, that misery will certainly be removed. If thou meetest failure, then that will furnish a proof unto thee and Vrikodara and Vivatsu and the twins (that ye are unable to snatch the kingdom from the foe). The acts of others, it is seen, are crowned with success. It is probable that ours also will be successful. How can one know beforehand what the consequence will be?