ते तं भुक्त्वा स्वर्गलोकं विशालं
क्षीणे पुण्ये मर्त्यलोकं विशन्ति।
गतागतं कामकामा लभन्ते।।9.21।।
9.21. Having enjoyed that vast world of heaven, they, when their merit is exhausted, enter the world of the mortals. Thus the persons, who long for pleasure and continuously take refuge in the code of conduct prescribed by the Three Vedas, attain the state of going and coming.
9.20-21 Traividyah etc. Te tam etc. Of course, they worship Me (Vasudeva) alone. However, the action [like sacrifice] is limited (or is known [to them]) by their aspiration for heaven only. Hence, on account of the weakness is their own being (sattva), they condition the action solely by the result of the heaven. That is why their religious act leads to rirth and thus they attain the state of going and coming. But [on that account] it is not the inherent nature of the sacrifice to beget rirth. For instance :
Te tam bhuktwaa swargalokam vishaalamKsheene punye martyalokam vishanti; Evam trayeedharmamanuprapannaaGataagatam kaamakaamaa labhante.
te—they; tam—that; bhuktvā—having enjoyed; swarga-lokam—heaven; viśhālam—vast; kṣhīṇe—at the exhaustion of; puṇye—stock of merits; martya-lokam—to the earthly plane; viśhanti—return; evam—thus; trayī dharmam—the karm-kāṇḍ portion of the three Vedas; anuprapannāḥ—follow; gata-āgatam—repeated coming and going; kāma-kāmāḥ—desiring objects of enjoyments; labhante—attain