Chapter 9, Verse 21
Part of 9: Rāja Vidyā Yog — राजविद्याराजगुह्ययोगते तं भुक्त्वा स्वर्गलोकं विशालं क्षीणे पुण्ये मर्त्यलोकं विशन्ति। एव त्रयीधर्ममनुप्रपन्ना गतागतं कामकामा लभन्ते॥
te taṁ bhuktvā swarga-lokaṁ viśhālaṁ kṣhīṇe puṇye martya-lokaṁ viśhanti evaṁ trayī-dharmam anuprapannā gatāgataṁ kāma-kāmā labhante
They, having enjoyed the vast heaven, enter the world of mortals when their merit is exhausted; thus abiding by the injunctions of the three (Vedas) and desiring objects of desires, they attain to the state of coming and going.
When the accumulated merit (the cause of heavenly pleasures) is exhausted, they descend to this world. They come and go. They have no independence. The Dharma of the three Mere Vedic ritual, enjoined by the three Vedas. KamaKamah The people whose minds are filled with Vasanas or worldly tendencies.