By karma everyone is working, but even (everyone) is working in three modes of nature. This material world, there are three modes of nature: sattva-guṇa, rajo-guṇa, tamo-guṇa. So if you are working in tamo-guṇa, then you are preparing a body of tamo-guṇa. If you are working rajo-guṇa, then you are preparing a body for rajo-guṇa. Similarly, sattva-guṇa. Everything is described in the Bhagavad-gītā. What is the different result? Ūrdhvaṁ gacchanti sattva-sthāḥ. Those who are working in sattva-guṇa, they will go to the higher planetary systems. There are Janaloka, Maharloka, Tapoloka, Brahmaloka, Satyaloka, Siddhaloka. You'll go there. Ūrdhvaṁ gacchanti sattva-sthā madhye tiṣṭhanti rājasāḥ (BG 14.18).
And if you want to remain in the middle planetary system, then that is rajo-guṇa. And jaghanya-guṇa-vṛtti-sthā adho gacchanti tāmasāḥ. And those who are working in tamo-guṇa, jaghanya, most abominable behavior, they will go to the animal kingdom or the lower planetary system. This is the process. As you are contaminating, kāraṇaṁ guṇa-saṅgo 'sya sad-asad-janma-yoniṣu (BG 13.22). Sat and asat-janma. Why there are so many varieties of life? Cats, dogs, trees, aquatics, birds, beasts, human beings, demigods, civilized, uncivilized, so many. Why there are so many varieties? Kāraṇaṁ guṇa-saṅgo 'sya. As he is associating with different types of qualities, he is getting a different types of body. This is going on. Therefore Caitanya Mahāprabhu says:
- ei rūpe brahmāṇḍa bhramite kona bhāgyavān jīva
- guru-kṛṣṇa-kṛpāya pāya bhakti-latā-bīja
- (CC Madhya 19.151)
Caitanya Mahāprabhu says: "The living entity is rotating within this universe," brahmāṇḍa bhramite. Sometimes this planet, sometimes that planet, sometimes this body, sometimes that body. In this way he is rotating from time immemorial. But by chance, fortunate, by fortune, if he gets in touch of a proper guru and then he gets Kṛṣṇa . . . guru-kṛṣṇa-kṛpāya.