He had no other business than to think of Kṛṣṇa. But by formality he did not become a Vaiṣṇava or chanting. But he was always thinking of Kṛṣṇa. Therefore he is certified as the foremost yogi. Yoginām api sarveṣām (BG 6.47).
So that is the trick—how we shall always think of Kṛṣṇa even we are engaged in our occupation duty. That will make us perfect. Actually, real sva-dharma is to be attached to Kṛṣṇa. Because we are part and parcel of Kṛṣṇa, but because we have got this material body, we have got this bodily concept of life. Therefore the Vedic injunction is divided that one class should be brāhmaṇa, one class should be kṣatriya, one class should be vaiśya, another should be śūdra. In this way they should cooperate for the ultimate benefit of life, just like in our body there is the head, there is the arm, there is the belly and there is the leg. So we are all cooperating for upkeep of the body. Similarly, if either as a brāhmaṇa or as a kṣatriya or as a śūdra we keep up in mind that we have to serve Kṛṣṇa, then in either position we can become perfect. That is confirmed in many places.
- ataḥ pumbhir dvija-śreṣṭhā
- varṇāśrama-vibhāgaśaḥ
- svanuṣṭhitasya dharmasya
- saṁsiddhir hari-toṣaṇam
- (SB 1.2.13)
In whichever position you may be, if you try to satisfy Kṛṣṇa according to your capacity, sva-dharmācaraṇa śaktyā, here it is said. Sva-dharmācaraṇaṁ śaktyā vidharmāc ca nivartanam. Vidharma . . . vidharma means anti, anti-occupational duty. Ultimately our occupational duty is to serve Kṛṣṇa.