te taṁ bhuktvā swarga-lokaṁ viśhālaṁ
kṣhīṇe puṇye martya-lokaṁ viśhanti
evaṁ trayī-dharmam anuprapannā
gatāgataṁ kāma-kāmā labhante||21||

Meaning : After enjoying the vast pleasures of heaven, when their earned merit is exhausted, they return to the mortal world. Thus, those who follow Vedic rituals and seek desires keep going back and forth between higher and lower worlds.