It is the duty of a father and mother to arrange for the marriage of their sons and daughters. That is the obligation in Vedic society. Sons and daughters should not be allowed freedom to intermingle with the opposite sex unless they are married. This Vedic social organization is very good in that it stops the promulgation of illicit sex life, or varṇa-saṅkara, which appears under different names in this present day. Unfortunately in this age although the father and mother are anxious to get their children married, the children refuse to get married by the arrangement of the parents. Consequently, the number of varṇa-saṅkara has increased throughout the world under different names.
(Srimad Bhagavatam-------4:27:8---------purport).

Vasudeva and Devakī were full of anxieties for Kṛṣṇa's and Balarāma's protection, but they could not enjoy Their childhood pastimes. Kṛṣṇa said, "Unfortunately, being ordered by Our fate, We could not be raised by Our own parents to enjoy childhood pleasures at home. My dear Father and Mother, a man cannot repay his debt to his parents, from whom he gets this body, which can bestow upon him all the benefits of material existence. According to the Vedic injunctions, this human form of life enables one to perform all kinds of religious activities, fulfill all kinds of desires and acquire all kinds of wealth. And only in this human form is there every possibility that one can get liberation from material existence. This body is produced by the combined efforts of the father and mother. Every human being should be obliged to his parents and understand that he cannot repay his debt to them. If, after growing up, a son does not try to satisfy his parents by his actions or by an endowment of riches, he is surely punished after death by the superintendent of death and made to eat his own flesh. If a person is able to care for or give protection to old parents, a chaste wife, children, the spiritual master, brāhmaṇas and other dependents but does not do so, he is considered already dead, although he is supposedly breathing.
(Krsna Book).

The Supreme Personality of Godhead chooses a mother and father from whom to take birth again and again. The Lord took birth originally from Sutapā and Pṛśni, then from Kaśyapa and Aditi, and again from the same father and mother, Vasudeva and Devakī. "In other appearances also," the Lord said, "I took the form of an ordinary child just to become your son so that we could reciprocate eternal love." Jīva Gosvāmī has explained this verse in his Kṛṣṇa-sandarbha, Ninety-sixth Chapter, where he notes that in text 37 the Lord says, amunā vapuṣa, meaning "by this same form." In other words, the Lord told Devakī, "This time I have appeared in My original form as Śrī Kṛṣṇa." Śrīla Jīva Gosvāmī says that the other forms were partial expansions of the Lord's original form, but because of the intense love developed by Pṛśni and Sutapā, the Lord appeared from Devakī and Vasudeva in His full opulence as Śrī Kṛṣṇa. In this verse the Lord confirms, "I am the same Supreme Personality of Godhead, but I appear in full opulence as Śrī Kṛṣṇa." This is the purport of the words tenaiva vapuṣā. When the Lord mentioned the birth of Pṛśnigarbha, He did not say tenaiva vapuṣā, but He assured Devakī that in the third birth the Supreme Personality of Godhead Kṛṣṇa had appeared, not His partial expansion. Pṛśnigarbha and Vāmana were partial expansions of Kṛṣṇa, but in this third birth Kṛṣṇa Himself appeared. This is the explanation given in Śrī Kṛṣṇa-sandarbha by Śrīla Jīva Gosvāmī.
(Srimad Bhagavatam-------10:3:43---------purport).

When ecstatic love develops into the relationship of parenthood and becomes steadily established, the relationship is called vātsalya-rasa. The exhibition of this vātsalya-rasa standard of devotional service can be found in the dealings of Kṛṣṇa with His devotees who represent themselves as superior personalities like father, mother and teacher.
Learned scholars have described the impetuses for parental love for Kṛṣṇa, existing in the elderly personalities who are in relation with Him, as follows: "The Supreme Personality of Godhead, whose bodily complexion is just like a bluish, new-grown lotus flower, whose body is very delicate and whose lotus eyes are surrounded by scattered hair as black as bees, was walking on the streets of Vṛndāvana when mother Yaśodā, the beloved wife of Nanda Mahārāja, saw Him. Immediately the milk began to flow from her breasts, soaking her body." Some specific provocations for parental love of Kṛṣṇa are listed as His blackish bodily hue, which is very attractive and pleasing to see, His all-auspicious bodily features, His mildness, His sweet words, His simplicity, His shyness, His humility, His constant readiness to offer respect to the elderly and His charity. All of these qualities are considered ecstatic provocations for parental love.

(Nectar of Devotion).

The Lord appears in this universe in different incarnations like Matsya, Kūrma, Varāha and Nṛsiṁha, and He manifests His different transcendental activities for the welfare of the twice-born, the cows and the demigods. The Lord is directly concerned with the twice-born or civilized men. A civilized man is one who has taken his birth twice. A living entity takes birth in this mundane world due to the union of male and female. A human being is born due to union of the father and mother, but a civilized human being has another birth by contact with a spiritual master, who becomes the actual father. The father and mother of the material body are so only in one birth, and in the next birth the father and mother may be a different couple. But the bona fide spiritual master, as the representative of the Lord, is the eternal father because the spiritual master has the responsibility to lead the disciple to spiritual salvation, or the ultimate goal of life. Therefore, a civilized man must be twice-born, otherwise he is no more than the lower animals.

(Srimad Bhagavatam-------3:5:7---------purport).

In the darkness, if we want to perceive a certain object, we cannot use just our eyes; we have to rely on some other means to aid our perception. So, in the darkness, the object cannot be known to us in its entirety. In such a situation, even if we get some knowledge by touch or otherwise, it is all either mistaken or incomplete. It is just like the group of blind men who had encountered an elephant and tried to describe the strange new creature to one another. One man felt the trunk and said, "This is a huge snake." Another man felt a leg and said, "No, this is a great pillar." And so forth.
There is but one way to perceive things in the depth of darkness. Only if somebody brings a light into the darkness is it truly possible to see things as they are. Similarly, the light of knowledge is kindled by our preceptors, and we can see things as they are only by our preceptors' mercy. From our very birth we have become accustomed to gathering knowledge by the mercy of our preceptors, whether father, mother, or teacher. We can march along the path of progressive knowledge only by the help of such preceptors, from whom we gather experience by submissive hearing.

(Message of Godhead).