Either human being or animals or trees, birds, everywhere Kṛṣṇa says, or in the higher planetary system, everywhere, these three modes of material nature is working. Therefore, in the human society, because there are three modes of material nature, the classification should be made scientifically according to these three modes of material nature. And that is explained by Bhagavān, Śrī Kṛṣṇa, in the Bhagavad-gītā, cātur-varṇyaṁ mayā sṛṣṭam: (BG 4.13) four classes of men. Brāhmaṇa, kṣatriya, vaiśya and śūdra. Brāhmaṇa means the most intelligent class of men who can understand even up to the knowledge of Brahman, brahma jānāti iti brāhmaṇa. And the second class are the kṣatriyas or the administrative class of men, and the third-class are the mercantile class of men, industrialists, traders, agriculturalists. Everything will be explained. And the fourth-class men means workers. They have no intelligence, but they find out some good master and get some money. That's all. So there are four classes. So here Kṛṣṇa says,
- brāhmaṇa-kṣatriya-viśāṁ
- śūdrāṇāṁ ca parantapa
- karmāṇi pravibhaktāni
- svabhāva-prabhavair guṇaiḥ
According to the modes of material nature, the brāhmaṇa should be selected, the kṣatriya should be selected, the vaiśyas or the mercantile people should be selected, and the śūdras, the worker class, should be selected.
Then Kṛṣṇa says, that how the brahminical class should be educated. This should be taken very seriously by educational department of all countries. And it is the duty of the government to see that every man according to his quality is working, is employed. Not that... Secular state does not mean they should be callous about the quality and work of the citizens. There must be department of practical psychology to see the students, in which class he belongs to. Either he belongs to the first-class, brāhmaṇa class, or second-class, the kṣatriya class, administrator class, and the third-class, mercantile, or business man, and the fourth-class, śūdras, worker. If education is given according to the quality and position, then there will be complete system in the whole human society. Take the same example. Just like your body, if your head is working nicely, if your hand is working nicely, if your stomach is working nicely, if your leg is working nicely, then the whole body is to be considered as healthy and working nicely. If any part of this body, either head, leg, or arms or belly, does not work nicely, then the whole body becomes diseased. So that is the instruction of Kṛṣṇa, Bhagavad-gītā.