So this science is unknown to the rascal civilization, how to utilize things for the best purpose. So in the Bhagavad-gītā you will find, kṛṣi-go-rakṣya-vāṇijyaṁ vaiśya-karma svabhāva-jam (BG 18.44). Vaiśyas... First-class men, brāhmaṇa; second-class men, the kṣatriya; third-class men, the vaiśyas; and fourth-class men, all others, the worker class, śūdras. So the first-class men, the brāhmaṇa, they should give instruction, nice instruction, so that the whole human society will profit. By seeing the character of the brāhmaṇa, the behavior of the brāhmaṇa... Śamo damaḥ satyaṁ śaucaṁ titikṣā kṣāntir eva ca, jñānaṁ vijñānam. A brāhmaṇa is not, never recommended, a brāhmaṇa will make some trade or become a engineer. No. Śamo damas titikṣā, these are the qualification, characteristics, of brāhmaṇa. And śāstra says yasya yal lakṣaṇaṁ proktaṁ puṁso varṇābhivyañjakam, tat tenaiva vinirdiśet (SB 7.11.35). When there is characteristics of a brāhmaṇa, then you should accept him as a brāhmaṇa. Not whimsically. Similarly, kṣatriya, he must be very strong and chivalrous and never be go, I mean, fly away from battle. They should come forward when there is some battle, riot. They should give protection. They are kṣatriyas. And vaiśya means... Now, the brāhmaṇas, they are not going to produce food or other things. They are simply for knowledge, giving the best knowledge to the human society. There is a need of brāhmaṇa. Everyone śūdra, simply working hard and because they are accusing, "Oh, you people are escaping..." What is escaping? We are giving the best knowledge to the human society.
So it is specially mentioned, kṛṣi-go-rakṣya-vāṇijyam (BG 18.44). The vaiśyas, food production means produce food grains, agricultural. By agriculture, you can. So much land is vacant all over the world. They are producing coffee. I have seen in Africa. Vast land is engaged in producing coffee. No food grain. So this is the defect of the civilization. They do not know how to live. Will man die without drinking coffee? No. That is not the fact. But man will die if they have no real food, anna, food grains. If you think that "I eat meat. I don't require food grains," but the cows, the animal eat food grains. So without food grain, how we can live? Therefore Kṛṣṇa says in the Bhagavad-gītā, annād bhavanti bhūtāni (BG 3.14). You produce food grains. Why you are producing so much unnecessary things—television and tools, and stool also, so many thing. Why? They are not necessary. Live in the village, produce your own food, your own cloth, and drink milk sufficiently—all economic questions solved. Then you become suśīla, well behaved. And if you go on killing animals and drinking wine and gambling, when you will be suśīla? You are always bad character.