Mahabharata 3.33.26

3.33.26

tataḥ pravartate paścātkaraṇeṣvasya siddhaye |
tāṃ siddhimupajīvanti karmaṇāmiha jantavaḥ || 26 ||

And creatures support their lives by the results achieved in these directions by their own acts. If a work is executed by a skilled workman, it is executed well. From differences (in characteristics), another work may be said to be that of an unskilful hand. If a person were not, in the matter of his acts, himself the cause thereof, then sacrifices would not bear any fruits in his case nor would any body be a disciple or a master. It is because a person is himself the cause of his work that he is applauded when he achieved success. So the doer is censured if he faileth. If a man were not himself the cause of his acts, how would all this be justified? Some say that everything is the result of Providential dispensation; others again, that this is not so, but that everything which is supposed to be the result of destiny or chance is the result of the good or the bad acts of former lives. It is seen, possessions are obtained from chance, as also from destiny Something being from destiny and something from chance, something is obtained by exertion. In the acquisition of his objects, there is no fourth cause in the case of man. Thus say those that are acquainted with truth and skilled in knowledge. If, however, God himself were not the giver of good and bad fruits, then amongst creatures there would not be any that was miserable. If the effect of former acts be a myth, then all purposes for which man would work should be successful.