Looking at the Cultural Background
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atheistic theory, which is described in the Sixteenth Chapter of the  Bhagavad-gītā  as asuric, or demonic, is that actually everything is going on in this way, because of chance and resulting from natural attraction. This demonic theory supports the idea that if one wants to avoid children, he may use a contraceptive method.
Actually, however, there is a great plan for everything—the Vedic plan. The Vedic literature gives directions regarding how men and women should unite, how they should beget children, and what the purpose of sex life is. Kṛṣṇa says in the  Bhagavad-gītā  that sex life sanctioned by the Vedic order, or sex life under the direction of the Vedic rules and regulations, is bona fide and is acceptable to Him. But chance sex life is not acceptable. If by chance one is sexually attracted and there are children, they are called  varṇa-saṅkara , unwanted population. That is the way of the lower animals; it is not acceptable for humans. For humans, there is a plan. We cannot accept the theory that there is no plan for human life or that everything is born of chance and material necessity.
Śaṅkarācārya's theory that there is no God and that one can go on with his work and imagine God in any form just to keep peace and tranquillity in society is also more or less based on this idea of chance and necessity. Our way, however, which is completely different, is based on authority. It is this divine  varṇāśrama-dharma  that Kṛṣṇa recommends, not the caste system as it is understood today. This modern caste system is now condemned in India also, and it should be condemned, for the classification of different types of men according to birth is not the Vedic or divine caste system.
There are many classes of men in society—some men are engineers, some are medical practitioners, some are chemists, tradesmen, businessmen, and so on. These varieties of classes are not to be determined by birth, however, but by quality. No such thing as the caste-by-birth system is sanctioned by the Vedic literature, nor do we accept it. We have nothing to do with the caste system, which is also at present being rejected by the public in India. Rather, we give everyone the chance to become a  brāhmaṇa  and thus attain the highest status of life.
Because at the present moment there is a scarcity of  brāhmaṇas , spiritual guides, and  kṣatriyas , administrative men, and because the entire world is being ruled by  śūdras , or men of the manual laborer class, there are many discrepancies in society. It is to mitigate all these discrepancies that we have taken to this Kṛṣṇa consciousness movement. If the  brāhmaṇa  class is actually reestablished, the other orders of social well-being will automatically follow, just as when the brain is perfectly in