Nanda and Sunanda, the two confidential associates of Lord Viṣṇu, said: Dear King, let there be all good fortune unto you. Please attentively hear what we shall say. When you were only five years old, you underwent severe austerities, and you thereby greatly satisfied the Supreme Personality of Godhead.
What was possible for Dhruva Mahārāja is possible for anyone. Any five-year-old child can be trained, and within a very short time his life will become successful by realization of Kṛṣṇa consciousness. Unfortunately, this training is lacking all over the world. It is necessary for the leaders of the Kṛṣṇa consciousness movement to start educational institutions in different parts of the world to train children, starting at the age of five years. Thus such children will not become hippies or spoiled children of society; rather, they can all become devotees of the Lord. The face of the world will then change automatically.
(Srimad Bhagavatam-----4:12:23-----purport).

The ācāryas specifically mention that in this verse the words mātuḥ anugrahāt ("by the mercy of their mother") refer to the breast milk of their mother. In India it is a common belief that if a baby is fed his mother's milk for at least six months, his body will be very strong. Besides that, it is mentioned herein that all the sons of Āgnīdhra were endowed with the nature of their mother. Bhagavad-gītā (1.40) also declares, strīṣu duṣṭāsu vārṣṇeya jāyate varṇa-saṅkaraḥ: when women are polluted, varṇa-saṅkara, unqualified children, are generated, and when the varṇa-saṅkara population increases, the entire world becomes hellish. Therefore, according to Manu-saṁhitā, a woman needs a great deal of protection in order to remain pure and chaste so that her children can be fully engaged for the benefit of human society.
(Srimad Bhagavatam-----5:2:21-----purport).

If anyone wants to enjoy the childhood pastimes of the Lord, then he has to follow in the footsteps of the residents of Vraja like Nanda, Upananda and other parental inhabitants. A child may insist on having something and cry like anything to get it, disturbing the whole neighborhood, and then immediately after achieving the desired thing, he laughs. Such crying and laughing is enjoyable to the parents and elderly members of the family, so the Lord would simultaneously cry and laugh in this way and merge His devotee-parents in the humor of transcendental pleasure. These incidents are enjoyable only by the residents of Vraja like Nanda Mahārāja, and not by the impersonalist worshipers of Brahman or Paramātmā. Sometimes when attacked in the forest by demons, Kṛṣṇa would appear struck with wonder, but He looked on them like the cub of a lion and killed them. His childhood companions would also be struck with wonder, and when they came back home they would narrate the story to their parents, and everyone would appreciate the qualities of their Kṛṣṇa. Child Kṛṣṇa did not belong only to His parents, Nanda and Yaśodā; He was the son of all the elderly inhabitants of Vṛndāvana and the friend of all contemporary boys and girls. Everyone loved Kṛṣṇa. He was the life and soul of everyone, including the animals, the cows and the calves.
(Srimad Bhagavatam-----3:2:28-----purport).

Kardama Muni expressed his desire for a very beautiful wife to Emperor Svāyambhuva and accepted the Emperor's daughter for marriage. Kardama Muni was in the hermitage practicing complete celibacy as a brahmacārī, and although he had the desire to marry, he did not want to be a householder for the whole span of his life because he was conversant with the Vedic principles of human life. According to Vedic principles, the first part of life should be utilized in brahmacarya for the development of character and spiritual qualities. In the next part of life, one may accept a wife and beget children, but one should not beget children like cats and dogs.
Kardama Muni desired to beget a child who would be a ray of the Supreme Personality of Godhead. One should beget a child who can perform the duties of Viṣṇu, otherwise there is no need to produce children. There are two kinds of children born of good fathers: one is educated in Kṛṣṇa consciousness so that he can be delivered from the clutches of māyā in that very life, and the other is a ray of the Supreme Personality of Godhead and teaches the world the ultimate goal of life. As will be described in later chapters, Kardama Muni begot such a child-Kapila, the incarnation of the Personality of Godhead who enunciated the philosophy of Sāṅkhya. Great householders pray to God to send His representative so that there may be an auspicious movement in human society. This is one reason to beget a child. Another reason is that a highly enlightened parent can train a child in Kṛṣṇa consciousness so that the child will not have to come back again to this miserable world. Parents should see to it that the child born of them does not enter the womb of a mother again. Unless one can train a child for liberation in that life, there is no need to marry or produce children. If human society produces children like cats and dogs for the disturbance of social order, then the world becomes hellish, as it has in this age of Kali. In this age, neither parents nor their children are trained; both are animalistic and simply eat, sleep, mate, defend, and gratify their senses. This disorder in social life cannot bring peace to human society. Kardama Muni explains beforehand that he would not associate with the girl Devahūti for the whole duration of his life. He would simply associate with her until she had a child. In other words, sex life should be utilized only to produce a nice child, not for any other purpose. Human life is especially meant for complete devotion to the service of the Lord. That is the philosophy of Lord Caitanya.
After fulfilling his responsibility to produce a nice child, one should take sannyāsa and engage in the perfectional paramahaṁsa stage. paramahaṁsa refers to the most highly elevated perfectional stage of life. There are four stages within sannyāsa life, and paramahaṁsa is the highest order. The Śrīmad-Bhāgavatam is called the paramahaṁsa-saṁhitā, the treatise for the highest class of human beings. The paramahaṁsa is free from envy. In other stages, even in the householder stage of life, there is competition and envy, but since the activities of the human being in the paramahaṁsa stage are completely engaged in Kṛṣṇa consciousness, or devotional service, there is no scope for envy. In the same order as Kardama Muni, about one hundred years ago, Ṭhākura Bhaktivinoda also wanted to beget a child who could preach the philosophy and teachings of Lord Caitanya to the fullest extent. By his prayers to the Lord he had as his child Bhaktisiddhānta Sarasvatī Gosvāmī Mahārāja, who at the present moment is preaching the philosophy of Lord Caitanya throughout the entire world through his bona fide disciples.
(Srimad Bhagavatam-----3:22:19-----purport).

According to Ṛṣabhadeva, one should not become a father or mother unless one is confident that he can beget children whom he can deliver from the clutches of birth and death. Human life is the only opportunity to get out of the material scene, which is full of the miseries of birth, death, old age and diseases. Every human being should be given the opportunity to take advantage of his human form of life, and a father like Kaśyapa is supposed to beget good children for the purpose of liberation.
(Srimad Bhagavatam-----3:14:12-----purport).

According to Vedic civilization, if a girl gives birth to a child before she is married, no one will marry her. Therefore although the sun-god, after appearing before Pṛthā, wanted to give her a child, Pṛthā hesitated because she was still unmarried. To keep her virginity undisturbed, the sun-god arranged to give her a child that came from her ear, and therefore the child was known as Karṇa. The custom is that a girl should be married akṣata-yoni, that is, with her virginity undisturbed. A girl should never bear a child before her marriage.
(Srimad Bhagavatam-----9:24:34-----purport).

It is foretold in the Twelfth Canto of the Bhāgavatam that in this age of Kali married life will be accepted on the consideration of sex only; when the boy and girl are pleased in sex, they get married, and when there is deficiency in sex, they separate. That is not actual marriage, but a combination of men and women like cats and dogs. Therefore, the children produced in the modern age are not exactly human beings. Human beings must be twice-born. A child is first born of a good father and mother, and then he is born again of the spiritual master and the Vedas. The first mother and father bring about his birth into the world; then the spiritual master and the Vedas become his second father and mother. According to the Vedic system of marriage for producing children, every man and woman was enlightened in spiritual knowledge, and at the time of their combination to produce a child, everything was scrutinizingly and scientifically done.
(Srimad Bhagavatam-----3:24:15-----purport).

In this verse the word hṛdaya indicates the heart, which is also called uraḥ, the chest. The heart is situated within the chest, and although instrumentally the son is born with the aid of the genitals, he is actually born from within the heart. According to the heart's situation. the semen takes the form of a body. Therefore according to the Vedic system, when one begets a child his heart should be purified through the ritualistic ceremony known as garbhādhāna. Ṛṣabhadeva's heart was always uncontaminated and spiritual. Consequently all the sons born from the heart of Ṛṣabhadeva were spiritually inclined. Nonetheless. Ṛṣabhadeva suggested that His eldest son was superior, and He advised the others to serve him. All the brothers of Bharata Mahārāja were advised by Ṛṣabhadeva to adhere to Bharata's service. The question may be asked why one should be attached to family members, for in the beginning it was advised that one should not be attached to home and family. However, it is also advised, mahīyasām pāda-rajo-'bhiṣeka—one has to serve the mahīyān, one who is very spiritually advanced. Mahat-sevāṁ dvāram āhur vimukteḥ: (S.B.5:5:2) by serving the mahat, the exalted devotee, one's path for liberation is open. The family of Ṛṣabhadeva should not be compared to an ordinary materialistic family. Bharata Mahārāja, Ṛṣabhadeva's eldest son, was specifically very exalted. For this reason the other sons were advised to serve him for his pleasure. That was to be their duty.
(Srimad Bhagavatam-----5:5:20-----purport).

As for detachment from children, wife and home, it is not meant that one should have no feeling for these. They are natural objects of affection. But when they are not favorable to spiritual progress, then one should not be attached to them. The best process for making the home pleasant is Kṛṣṇa consciousness. If one is in full Kṛṣṇa consciousness, he can make his home very happy, because this process of Kṛṣṇa consciousness is very easy. One need only chant Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare, accept the remnants of foodstuffs offered to Kṛṣṇa, have some discussion on books like Bhagavad-gītā and Śrīmad-Bhāgavatam, and engage oneself in Deity worship. These four things will make one happy. One should train the members of his family in this way. The family members can sit down morning and evening and chant together Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. If one can mold his family life in this way to develop Kṛṣṇa consciousness, following these four principles, then there is no need to change from family life to renounced life. But if it is not congenial, not favorable for spiritual advancement, then family life should be abandoned. One must sacrifice everything to realize or serve Kṛṣṇa, just as Arjuna did. Arjuna did not want to kill his family members, but when he understood that these family members were impediments to his Kṛṣṇa realization, he accepted the instruction of Kṛṣṇa and fought and killed them. In all cases, one should be detached from the happiness and distress of family life, because in this world one can never be fully happy or fully miserable.
(Bhagavad-Gita-----13:8-12-----purport).

As confirmed in Bhagavad-gītā (2.40), svalpam apy asya dharmasya trāyate mahato bhayāt: "Even a little advancement on this path can protect one from the most dangerous type of fear." Modern civilization, not referring to the verdicts of Vedic literature, is so cruel to the members of human society that instead of teaching children to become brahmacārīs, it teaches mothers to kill their children even in the womb, on the plea of curbing the increase of population. And if by chance a child is saved, he is educated only for sense gratification. Gradually, throughout the entire world, human society is losing interest in the perfection of life. Indeed, men are living like cats and dogs, spoiling the duration of their human lives by actually preparing to transmigrate again to the degraded species among the 8,400,000 forms of life. The Kṛṣṇa consciousness movement is anxious to serve human society by teaching people to perform devotional service, which can save a human being from being degraded again to animal life. As already stated by Prahlāda Mahārāja, bhāgavata-dharma consists of śravaṇaṁ kīrtanaṁ viṣṇoḥ smaraṇaṁ pāda-sevanam/ arcanaṁ vandanaṁ dāsyaṁ sakhyam ātma-nivedanam (S.B.7:5:23). In all the schools, colleges and universities, and at home, all children and youths should be taught to hear about the Supreme Personality of Godhead. In other words, they should be taught to hear the instructions of Bhagavad-gītā, to put them into practice in their lives, and thus to become strong in devotional service, free from fear of being degraded to animal life. Following bhāgavata-dharma has been made extremely easy in this age of Kali.
(Srimad Bhagavatam-----7:6:1-----purport).