Brahman realization, "I am not this body, I am spirit soul, part and parcel of God," when we understand this position, then we are liberated from the reaction of karma, or material activities.
So Sūta Gosvāmī addressed dvija-śreṣṭhāḥ. Not only brāhmaṇa but, "the best of the brāhmiṇs." "The best of the brāhmiṇ" means Kṛṣṇa conscious, one who knows the Supreme Personality of Godhead. Brāhmaṇa means one who knows the spirit distinguished from the matter. Brahma jānāti iti brāhmaṇaḥ. But when he understands the Supreme Brahman, Para-brahman, Kṛṣṇa, then he actually becomes brāhmaṇa-vaiṣṇava. Brāhmaṇa should advance further to become Vaiṣṇava. Therefore one who is Vaiṣṇava, he is already a brāhmaṇa. This is to be understood. So Sūta Gosvāmī said: "O the great brāhmins present here . . ." Brāhmiṇs. Ataḥ pumbhir dvija-śreṣṭhāḥ (SB 1.2.13), the best of the brāhmiṇs.
Ataḥ pumbhir dvija-śreṣṭhā varṇāśrama-vibhāgaśaḥ. There are division. In the human society there should be divisions of work. The activities for the most intellectual person, that should be a division. That is called brāhmaṇa division. The activities of the politicians and administrators, that is called kṣatriya division. The activities of the mercantile people, that is called vaiśya division. And ordinary worker, they get some salary for serving the master, they are called śūdras. So in this way everybody has got his duty. The brāhmaṇa has got his duty, the kṣatriya has got his duty, the vaiśya has got his duty, and the śūdras also, they have got also duty.
Similarly, brahmacārī, he has got his duty, and the gṛhastha, householder, they have got their duties, and vānaprastha, retired life, they have got their duties, and the sannyāsī, renounced order of life, they have got their duties. The first division is called varṇa: brāhmaṇa, kṣatriya, vaiśya, śūdra. And the second division is called āśrama. So Vedic civilization means varṇa and āśrama, the human society divided into varṇas and āśramas. So everyone has got his particular duty.