They are described in the Bhagavad-gītā, brāhmaṇa qualification, kṣatriya qualification, vaiśya qualification, śūdra qualification. So... Very nice arrangement, Vedic civilization. Everyone is guided by the superior. The brāhmaṇa guides the kṣatriyas, the kṣatriya guides the vaiśyas, and the vaiśya employs the śūdras. Cātur-varṇyaṁ mayā sṛṣṭaṁ guṇa-karma-vibhāgaśaḥ (BG 4.13). In this way, four divisions of brāhmaṇa, kṣatriya, vaiśya, they manage the whole society so nicely. The kṣatriyas, as the kṣatriya's business was to give protection to the citizens, similarly, vaiśya's duty was to give protection to the animals. Kṛṣi-go-rakṣya-vāṇijyaṁ vaiśya-karma svabhāva-jam (BG 18.44).
Vaiśya, they should engage themselves in agricultural production and giving protection to the cows, especially mentioned, go-rakṣya. Go-rakṣya, cow protection, is one of the items of state affairs. And now there is no cow protection. Poor cows, they deliver milk, and later on they become slaughtered. How much sinful the modern society is, and they still want peace and prosperity. That is not possible. The society must be divided—brāhmaṇa, kṣatriya, vaiśya, śūdra—and they must execute their proper duty. And the vaiśyas, they should give protection to the cows. And the śūdras, they should work under the direction of the higher three divisions. In this way there will be nice management.
Then, as it is stated during the reign of Mahārāja Yudhiṣṭhira, kāmaṁ vavarṣa parjanyaḥ (SB 1.10.4). Then nature also will help. If you keep things all right, according to the direction, then nature also will help you. Nature will give you sufficient foodstuff. Vavarṣa parjanyaḥ, kāmam. Whatever the necessities of life, it will be supplied by nature simply by proper pouring of water, vṛṣṭi. Actually, now the whole world is suffering for drought. There is scarcity of rain. And if the rain is stopped for one or two years more, there will be havoc. It is already there, havoc. In India there is famine, because they are more, mostly agriculturists. So there is famine. In other countries they have got industries. But India is not so industrially advanced. So without water, nothing can be produced.