Lord Kṛṣṇa said that, "The four classes or orders of the society, brāhmaṇa, kṣatriya, vaiśya, śūdra, is planned by Me according to work and quality." So this kṣatriya quality men is also required, the brāhmaṇa quality of men is also required, the mercantile style of community, they are also required, and the laborer class, they are also required.
Of course, laborer class, they do not require any training. Laborer class means one who cannot do anything, neither become brahmin, nor become kṣatriya, nor become vaiśya. That means the last balance of the population, they are called laborer class, śūdra. Śūdra means one who has no training. Śūdra has no saṁskāra. Saṁskāra means training. Everyone is accepted as śūdra by birth. Janmanā jāyate śūdraḥ. Janmanā means by birth. By birth, everyone is born a śūdra, a fourth-class man. It is to be accepted, and actually so. Just like a child, innocent child, what does he know? He has to be trained. Either you train him as a brahmin or train him as a kṣatriya or train him as a vaiśya. Or otherwise, he is śūdra already, born śūdra. Śūdra has no training. Everyone, the basic principle, basic foreground, everyone, it is accepted śūdra. Now, if you train him as a brahmin, then he becomes a brahmin. If you train him as a kṣatriya, then he becomes a kṣatriya. If you train him as a vaiśya . . .
So I think this is . . . this system is very scientific, so that if you want really help of a really intelligent man or God-realized man, it is ready, the brahmin class. Just like if you require the help of a lawyer, you have got so many lawyers. If you require the help of medical man . . . because there are trained men. Similarly, the society requires to train a certain class of men to become brahmin. Just like we are training the Kṛṣṇa conscious. The Kṛṣṇa consciousness is meant for the brahmins. They are not meant for fighting, because they are not being trained for fighting. They have been trained for becoming brahmin.
Who is brahmin? Brahma jānāti iti brahmin. The four divisions are described like this. Janmanā jāyate śūdraḥ, everyone is born śūdra. That is accepted. Saṁskārād bhaved dvijaḥ. Now if you train him . . . never mind in which family he's born, you have to train him. Just like boys are sent to school for being trained. So everyone is accepted as śūdra, but you now train him. He goes to the guru-gṛha. Guru-gṛha means teacher's house.
Formerly, for being trained, there was no such big-scale school and colleges. Every village . . . still, fifty years before in India, in every village there was a small school conducted by the brahmin, and the village children would be trained up there. So he was sent for training. And there was no school fee. The boys will go there, and on behalf of the teacher or spiritual master, they will go, brahmacārī, door to door, and beg and bring forth alms, rice, ḍāl, grains and everything. That was the system. There was no school fee. There was no problem how to send a boy to the school.
So saṁskāra. Now he's trained up. The teacher sees the psychology of the boy, in which way he should be trained. Either he should be trained as a vaiśya or he should be trained as a kṣatriya. So everyone was trained like that, but generally, the son of a kṣatriya . . . just like Mahārāja Rāmacandra or Arjuna, from the very beginning they were trained as kṣatriya.
Naturally, if somebody is the son of a medical man his father trains him to become a medical man in future. That is the natural tendency. If the boy is different altogether, that is another question; but naturally, that is the tendency. So a kṣatriya's son was trained as kṣatriya, a brahmin's son was trained as a brahmin and a vaiśya's son was trained as a vaiśya, and śūdra had no training.