Topmost of the twice-born means brāhmaṇa.
So although they were learned brāhmaṇas, or dvija... Dvija means not only brāhmaṇas, but the kṣatriyas or the vaiśyas. Kṣatriya means ruling class, administrative class, politicians. They are called kṣatriyas. And brāhmaṇas means learned scholar in philosophy, in science, in theology, they are brāhmaṇas. And kṣatriyas, and vaiśyas... Vaiśyas means traders, mercantile people. And śūdras means worker, laborer. So the brāhmaṇas and the kṣatriyas and the vaiśyas, they are called dvija. Dvija means twice-born. The śūdras, those who are once born simply by the father and mother, they are called śūdras. They are not counted amongst the higher class. But those who are twice-born. That means once born by the father and mother, and the second birth is the spiritual father and Vedic knowledge. Once born by this material bodily father and mother, and the second birth is Vedic knowledge, the mother, and the spiritual master, the father. So that is second birth. So second birth, those who accept the second birth, they are called dvija, twice-born. So he is addressing dvija. Ataḥ pumbhir dvija-śreṣṭhā: the topmost of the twice-born. Topmost of the twice-born means brāhmaṇa also, or these three classes. Take it for granted that the brāhmaṇas. But the next line is, ataḥ pumbhir dvija-śreṣṭhā varṇāśrama-vibhāgaśaḥ. There are four kinds of classification: the brāhmaṇas, the kṣatriyas, the vaiśyas, and the śūdras, and... This is called varṇa. And āśrama, āśrama means spiritual situation: the brahmacārī, the gṛhastha, the vānaprastha, and the sannyāsī. They are spiritually situated. So anyone, either a brahmacārī or a brāhmaṇa or a kṣatriya or anyone, he will fall down in either of these eight divisions of human social order. So Sūta Gosvāmī said that anyone, that means anyone, must have some occupation. Varṇāśrama-vibhāgaśaḥ. If you are engineer, then you have got some occupation. If you are medical man, you have got some occupation. If you are a philosopher, you have got some occupation. If you are laborer, worker, you have got some occupation. Even if you are a thief, you have got some occupation. So everyone has got occupation. So just see how nice it is. So Bhāgavata says, it doesn't matter what is your occupation, but simply try to see whether by your activities or a particular type of occupation you have satisfied the Supreme Lord. That's all.