You cannot say, "Oh, we don't require this head." Oh, it is nonsense. You require everything. You require the head, you require the arms, you require the belly, and you require the leg. This is fit body. Suppose if there is a body without head—oḥ, it is dead body. It is body undoubtedly, but if there is no head, simply the trunk is there, it is called dead body. The head is considered to be the intellectual part of the body. Similarly, if there is no brāhmaṇa in the society, that is a dead body. If there is no spiritual man in the society, that is a dead society.
This is very nice, natural division. Therefore Bhagavān Kṛṣṇa says, cātur-varṇyaṁ mayā sṛṣṭaṁ guṇa-karma-vibhāgaśaḥ: (BG 4.13) "I have created the four divisions of society according to quality and work." If somebody is working just like a brahmacārī, brāhmaṇa, and he has acquired the quality... What is that quality? To understand Kṛṣṇa or the Supreme Lord. So he's a brāhmaṇa. Why he should be called for the action of the arms? The arms for defending, that is kṣatriya. Of course, that is required. To protect the country, to protect the society, military arrangement should be there. Nobody disapproves. But not the brāhmaṇas. It is putting the horse before a cart. Horse is required for different purpose. Another beast of those, asses, mules and bulls, they are required for towing cart.