Mahabharata 10.2.11

10.2.11

utthānaṃ tu manuṣyāṇāṃ dakṣāṇāṃ daivavarjitam |
aphalaṃ dṛśyate loke samyagapyupapāditam || 11 ||

Sometimes, Destiny, having settled a course of events, acts of itself (without waiting for exertion). For all that, the wise, aided by skill have recourse to exertion. All the purposes of human acts, O bull among men, are accomplished by the aid of those two together. Influenced by these two, men are seen to strive or abstain. Recourse may be had to exertion. But exertion succeeds through destiny. It is in consequence also of destiny that one who sets himself to work, depending on exertion, attains to success. The exertion, however, of even a competent man, even when well directed, is without the concurrence of destiny, seen in the world to be unproductive of fruit. Those, therefore, among men, that are idle and without intelligence, disapprove of exertion. This however, is not the opinion of the wise.