The occupational duty of a brāhmaṇa should not be accepted by persons in lower social orders, especially vaiśyas and śūdras. For example, an occupational duty of the brāhmaṇa is to teach Vedic knowledge, but unless there is an emergency, this professional duty should not be accepted by the kṣatriyas, vaiśyas or śūdras. Even a kṣatriya cannot accept the duties of a brāhmaṇa unless there is an emergency, and then even if he does so he should not accept charity from anyone else. Sometimes brāhmaṇas protest against our Kṛṣṇa consciousness movement for creating brāhmaṇas from Europeans, or, in other words, from mlecchas and yavanas. This movement, however, is here supported in Śrīmad-Bhāgavatam. At the present moment, society is in a chaotic condition, and everyone has given up the cultivation of spiritual life, which is especially meant for the brāhmaṇas. Because spiritual culture has been stopped all over the world, there is now an emergency, and therefore it is now time to train those who are considered lower and condemned, so that they may become brāhmaṇasand take up the work of spiritual progress. The spiritual progress of human society has been stopped, and this should be considered an emergency. Here is solid support from Nārada Muni of the movement known as Kṛṣṇa consciousness.
(Srimad Bhagavatam-----7:11:17-----purport).

Those interested in materialistic activities remain in the cycle of birth and death. Pravṛtti-mārga, or the inclination to stay in the material world to enjoy varieties of sense gratification, has been explained in the previous verse. Now, in this verse, it is explained that one who has perfect brahminical knowledge rejects the process of elevation to higher planets and accepts nivṛtti-mārga; in other words, he prepares himself to go back home, back to Godhead. Those who are not brāhmaṇas but atheists do not know what is pravṛtti-mārga or nivṛtti-mārga; they simply want to obtain pleasure at any cost. Our Kṛṣṇa consciousness movement is therefore training devotees to give up the pravṛtti-mārga and accept the nivṛtti-mārga in order to return home, back to Godhead.
(Srimad Bhagavatam-----7:15:52-----purport).

The aim of the varṇāśrama divisions—brāhmaṇa, kṣatriya, vaiśya, śūdra, brahmacarya, gṛhastha, vānaprastha and sannyāsa—is to train one to control the senses and be content with the bare necessities. Here Lord Vāmanadeva, as an ideal brahmacārī, refuses Bali Mahārāja's offer to give Him anything He might want. He says that without contentment one could not be happy even if he possessed the property of the entire world or the entire universe. In human society, therefore, the brahminical culture, kṣatriya culture and vaiśya culture must be maintained, and people must be taught how to be satisfied with only what they need.
(Srimad Bhagavatam-----8:19:21-----purport).

According to brahminical culture, one should be content with whatever he obtains without special endeavor and should cultivate spiritual consciousness. Then he will be happy. The purpose of the Kṛṣṇa consciousness movement is to spread this understanding. People who do not have scientific spiritual knowledge mistakenly think that the members of the Kṛṣṇa consciousness movement are escapists trying to avoid material activities. In fact, however, we are engaged in real activities for obtaining the ultimate happiness in life. If one is not trained to satisfy the spiritual senses and continues in material sense gratification, he will never obtain happiness that is eternal and blissful.
(Srimad Bhagavatam-----8:19:24-----purport).

From Manu, one son became a kṣatriya, another a brāhmaṇa, and another a vaiśya. This confirms the statement by Nārada Muni, yasya yal lakṣaṇaṁ proktaṁ puṁso varṇābhivyañjakam (SB 7.11.35). One should always remember that brāhmaṇas, kṣatriyas and vaiśyas should never be regarded as members of a caste by birth. A brāhmaṇa may be changed into a kṣatriya, and a kṣatriya into a brāhmaṇa. Similarly, a brāhmaṇa or kṣatriya may be changed into a vaiśya, and a vaiśya into a brāhmaṇa or kṣatriya. This is confirmed in Bhagavad-gītā (cātur-varṇyaṁ mayā sṛṣṭaṁ guṇa-karma-vibhāgaśaḥ [Bg. 4.13]). So one is a brāhmaṇa, kṣatriya or vaiśya never by birth, but by quality. There is a great need of brāhmaṇas. Therefore, in the Kṛṣṇa consciousness movement, we are trying to train some brāhmaṇas to guide human society. Because at present there is a scarcity of brāhmaṇas, the brain of human society is lost. Because practically everyone is a śūdra, no one at the present moment can guide the members of society to the proper path by which to achieve perfection in life.
(Srimad Bhagavatam-----9:2:23-24-----purport).

Simply enforcing laws and ordinances cannot make the citizens obedient and lawful. That is impossible. Throughout the entire world there are so many states, legislative assemblies and parliaments, but still the citizens are rogues and thieves. Good citizenship, therefore, cannot be enforced; the citizens must be trained. As there are schools and colleges to train students to become chemical engineers, lawyers or specialists in many other departments of knowledge, there must be schools and colleges to train students to becomebrāhmaṇas, kṣatriyas, vaiśyas, śūdras, brahmacārīs, gṛhasthas, vānaprasthas and sannyāsīs. This will provide the preliminary condition for good citizenship (varṇāśrama-guṇān-vitāḥ).
(Srimad Bhagavatam-----9:10:50-----purport).

As we have seen from the previous chapter, varṇāśrama-guṇānvitāḥ: the citizens were trained according to the varṇāśrama system. A class of men werebrāhmaṇas, a class of men were kṣatriyas, a class were vaiśyas, and a class were śūdras. Without this scientific division, there can be no question of good citizenship. The King, being magnanimous and perfect in His duty, performed many sacrifices and treated the citizens as His sons, and the citizens, being trained in the varṇāśrama system, were obedient and perfectly ordered.
(Srimad Bhagavatam-----9:11:26-----purport).

A kṣatriya is one who saves the citizens from being injured. In the so-called people's government there is no trained kṣatriya king; as soon as someone strong accumulates votes, he becomes the minister or president, without training from the learned brāhmaṇas expert in the śāstras.
(Srimad Bhagavatam-----9:13:12-----purport).

The real business of a chief executive is to see to the happiness of the mass of people by training them in Kṛṣṇa consciousness in different divisions of life. Cātur-varṇyaṁ mayā sṛṣṭaṁ guṇa-karma-vibhāgaśaḥ (Bg. 4.13). A leader should train the people as brāhmaṇas, kṣatriyas, vaiśyas and śūdras and engage them in various occupational duties, thus helping them progress toward Kṛṣṇa consciousness.
(Srimad Bhagavatam-----10:1:17-----purport).

The blessings of brāhmaṇas who are not envious, disturbed or puffed up with pride and false prestige and who are fully qualified with truthfulness will be useful. Therefore a class of men must be trained as brāhmaṇas from the very beginning.
(Srimad Bhagavatam-----10:7:13-15-----purport).

As soon as Kṛṣṇa and Balarāma were a little grown up, They were meant for taking care of the calves. Although born of a very well-to-do family, They still had to take care of the calves. This was the system of education. Those who were not born in brāhmaṇa families were not meant for academic education. The brāhmaṇas were trained in a literary, academic education, the kṣatriyas were trained to take care of the state, and the vaiśyas learned how to cultivate the land and take care of the cows and calves. There was no need to waste time going to school to be falsely educated and later increase the numbers of the unemployed. Kṛṣṇa and Balarāma taught us by Their personal behavior. Kṛṣṇa took care of the cows and played His flute, and Balarāma took care of agricultural activities with a plow in His hand.
(Srimad Bhagavatam-----10:11:37-----purport).