Mbh 3.259.2

“Thus have I described unto thee the blessing of the celestial regions. Do thou now hear from me some of the disadvantages thereof. That in the celestial regions a person, while reaping the fruit of the acts he hath already performed, cannot be engaged in any others, and that he must enjoy the consequences of the former until they are completely exhausted, and, further, that he is subject to fall after he hath entirely exhausted his merit, form, in my opinion, the disadvantages of heaven. The fall of a person whose mind hath been steeped in happiness, must, O Mudgala, be pronounced as a fault. And the discontent and regret that must follow one’s stay at an inferior seat after one hath enjoyed more auspicious and brighter regions, must be hard to bear. And the consciousness of those about to fall is stupefied, and also agitated by emotions. And as the garlands of those about to fall fade away, fear invadeth their hearts. These mighty drawbacks, O Mudgala, extend even to the regions of Brahma. In the celestial regions, the virtues of men who have performed righteous acts, are countless. And, O Muni, this is another of the attributes of the fallen that, by reason of their merits, they take birth among men. And then they attain to high fortune and happiness. If one, however, cannot acquire knowledge here, one cometh by an inferior birth. The fruits of acts done in this world are reaped in the next. This world, O Brahmana, hath been declared to be one of acts; the others, as one of fruit. Thus have I, O Mudgala, asked by thee, described all unto thee. Now, O pious one, with thy favour, we shall easily set out with speed.’