If we understand what is the meaning of becoming brāhmaṇa, what is the meaning of becoming kṣatriya, what is the meaning of become a vaiśya, and what is the meaning of becoming śūdra... That is described in the Śrīmad-Bhāgavatam. Mukha-bāhūru-pādebhyaḥ. Mukha means the face, bāhu means the arms, ūru means the waist, and pāda, these legs. So mukha-bāhūru-pādebhyaḥ. These brāhmaṇa and the kṣatriya and the vaiśya and the śūdra, it should be taken as the different parts of the body of the virāṭ-puruṣa, Kṛṣṇa. Of the virāṭ-puruṣa.
So the brāhmaṇa's business you can understand—the mouth. You have got the tongue. Brāhmaṇa's business is to eat and to chant Vedic mantras. Therefore to give eatables to the Supreme Lord, according to our Vedic principle, the brāhmaṇas are called and they are given foodstuff, that "You eat. By your eating, Kṛṣṇa will eat." But that has been misused now, but actually that is the meaning. In the Vedic literature they do not say that "For some pious activities you call some poor men." No. Brāhmaṇas. Brāhmaṇa-bhajana. Because the brāhmaṇa is supposed to be the mouth of God. Similarly, kṣatriya is supposed to be the arms of God, the vaiśyas, the waist of God, and the śūdras, the legs of God.