Mbh 13.6.3b

Riches and other objects of enjoyment do not follow the stingy, nor the impotent, nor the idler. Nor are these ever attained by the man that is not active or manly or devoted to the exercise of religious austerities. Even he, the adorable Vishnu, who created the three worlds with the Daityas and all the gods, even He is engaged in austere penances in the bosom of the deep. If one's Karma bore no fruit, then all actions would become fruitless, and relying on Destiny men would become idlers. He who, without pursuing the human modes of action, follows Destiny only, acts in vain, like unto the woman that has an impotent husband. In this world the apprehension that accrues from performance of good or evil actions is not so great if Destiny be unfavourable as one's apprehension of the same in the other world if Exertion be wanting while here.[9] Man's powers, if properly exerted, only follow his Destiny, but Destiny alone is incapable of conferring any good where Exertion is wanting. When it is seen that even in the celestial regions, the position of the deities themselves is unstable, how would the deities maintain their own position or that of others without proper Karma? The deities do not always approve of the good deeds of others in this world, for, apprehending their own overthrow, they try to thwart the acts of others. There is a constant rivalry between the deities and the Rishis, and if they all have to go through their Karma, still it can never be averted that there is no such thing as Destiny, for it is the latter that initiates all Karma. How does Karma originate, if Destiny form the prime spring of human action? (The answer is) that by this means, an accretion of many virtues is made even in the celestial regions. One's own self is one's friend and one's enemy too, as also the witness of one's good and evil deeds. Good and evil manifest themselves through Karma. Good and evil acts do not give adequate results.