In the Viṣṇu Purāṇa it is said that the entire varṇāśrama institution is meant to satisfy the Supreme Personality of Godhead. The rules and regulations set up for the execution of the duties of brāhmaṇas, kṣatriyas, vaiśyas and śūdras or brahmacārīs, gṛhasthas, vānaprasthas and sannyāsīs are all meant to satisfy the Supreme Lord. At the present moment, although the so-called brāhmaṇas, kṣatriyas, vaiśyas and śūdras have lost their original culture, they claim to be brāhmaṇas, kṣatriyas, vaiśyas and śūdras by birthright. Yet they have rejected the proposition that such social and spiritual orders are especially meant for worship of Lord Viṣṇu.
(Srimad Bhagavatam-----4:21:27-----purport).

Before entering household life (gṛhastha-āśrama), a student is fully trained to become jitendriya, a conqueror of the senses. Such a mature student is allowed to become a householder, and because he was first trained in conquering his senses, he retires from household life and becomes vānaprastha as soon as the strong waves of youthful life are past and he reaches the verge of old age at fifty years or slightly more. Then, after being further trained, he accepts sannyāsa. He is then a fully learned and renounced person who can move anywhere and everywhere without fear of being captivated by material desires. The senses are considered very powerful enemies. As a king in a strong fortress can conquer powerful enemies, so a householder in gṛhastha-āśrama, household life, can conquer the lusty desires of youth and be very secure when he takes vānaprastha and sannyāsa.
(Srimad Bhagavatam-----5:1:18-----purport).

A gṛhastha, vānaprastha, sannyāsī and brahmacārī should be very careful when associating with women. One is forbidden to sit down in a solitary place even with one's mother, sister or daughter. In our Kṛṣṇa consciousness movement it has been very difficult to disassociate ourselves from women in our society, especially in Western countries. We are therefore sometimes criticized, but nonetheless we are trying to give everyone a chance to chant the Hare Kṛṣṇa mahā-mantra and thus advance spiritually. If we stick to the principle of chanting the Hare Kṛṣṇa mahā-mantra offenselessly, then, by the grace of Śrīla Haridāsa Ṭhākura, we may be saved from the allurement of women. However, if we are not very strict in chanting the Hare Kṛṣṇa mahā-mantra, we may at any time fall victim to women.
(Srimad Bhagavatam-----5:6:3-----purport).

If we do not take to the principles of varṇāśrama-dharma by accepting the four social orders (brāhmaṇa, kṣatriya, vaiśya and śūdra) and the four orders of spiritual life (brahmacārī, gṛhastha, vānaprastha and sannyāsa), there can be no question of success in life. Unfortunately, because of the influence of Kali-yuga, everything is now being lost. The inhabitants of Bhārata-varṣa are gradually becoming degraded mlecchas and yavanas. How then will they teach others? Therefore, this Kṛṣṇa consciousness movement has been started not only for the inhabitants of Bhārata-varṣa but for all the people of the world, as announced by Śrī Caitanya Mahāprabhu.
(Srimad Bhagavatam-----5:19:10-----purport).

The people who take birth in this tract of land are divided according to the qualities of material nature—the modes of goodness (sattva-guṇa), passion (rajo-guṇa), and ignorance (tamo-guṇa). Some of them are born as exalted personalities, some are ordinary human beings, and some are extremely abominable, for in Bhārata—varṣa one takes birth exactly according to one's past karma. If one's position is ascertained by a bona fide spiritual master and one is properly trained to engage in the service of Lord Viṣṇu according to the four social divisions (brāhmaṇa, kṣatriya, vaiśya and śūdra) and the four spiritual divisions (brahmacārī, gṛhastha, vānaprastha and sannyāsa), one's life becomes perfect.
(Srimad Bhagavatam-----5:19:19-----purport).

There are four classes of men, namely karmīs, jñānīs, yogīs and bhaktas. This statement pertains especially to karmīs and jñānīs. A karmī tries to he happy within this material world by changing from one body to another. His objective is bodily comfort, either in this planet or in another. When such a person becomes a jñānī, however, be aspires for liberation from material bondage. Among many such persons who aspire for liberation, one may actually be liberated during his life. Such a person gives up his attachment for society, friendship, love, country, family, wife and children. Among many such persons, who are in the vānaprastha stage, one may understand the value of becoming a sannyāsī, completely accepting the renounced order of life.
(Srimad Bhagavatam-----6:14:4-----purport).

In the varṇāśrama system, one first becomes a brahmacārī, then a gṛhastha, a vānaprastha and finally a sannyāsī. Going to the forest means accepting vānaprastha life, which is between gṛhastha life and sannyāsa. As confirmed in the Viṣṇu Purāṇa (3.8.9), varṇāśramācāravatā puruṣeṇa paraḥ pumān viṣṇur ārādhyate: (CC.2:8:58) by accepting the institution of varṇa and āśrama, one can very easily elevate himself to the platform of worshiping Viṣṇu, the Supreme Personality of Godhead. Otherwise, if one remains in the bodily conception, one must rot within this material world, and his life will be a failure. Society must have divisions of brāhmaṇa, kṣatriya, vaiśya and śūdra, and for spiritual advancement one must gradually develop as a brahmacārī, gṛhastha, vānaprastha and sannyāsī. Prahlāda Mahārāja recommended that his father accept vānaprastha life because as a gṛhastha he was becoming increasingly demoniac due to bodily attachment. Prahlāda recommended to his father that accepting vānaprastha life would be better than going deeper and deeper into gṛham andha-kūpam, the blind well of life as a gṛhastha. In our Kṛṣṇa consciousness movement we therefore invite all the elderly persons of the world to come to Vṛndāvana and stay there in retired life, making advancement in spiritual consciousness, Kṛṣṇa consciousness.
(Srimad Bhagavatam-----7:5:5-----purport).

One should not engage paid brāhmaṇas to worship the Deity. If one does not personally worship the Deity but engages paid servants instead, he is considered lazy, and his worship of the Deity is called artificial. An opulent householder can collect luxurious paraphernalia for Deity worship, and consequently for householder devotees the worship of the Deity is compulsory. In our Kṛṣṇa consciousness movement there are brahmacārīs, gṛhasthas, vānaprasthas and sannyāsīs, but the Deity worship in the temple should be performed especially by the householders. The brahmacārīs can go with the sannyāsīs to preach, and the vānaprasthas should prepare themselves for the next status of renounced life, sannyāsa. Gṛhastha devotees, however, are generally engaged in material activities, and therefore if they do not take to Deity worship, their falling down is positively assured. Deity worship means following the rules and regulations precisely. That will keep one steady in devotional service. Generally householders have children, and then the wives of the householders should be engaged in caring for the children, just as women acting as teachers care for the children in a nursery school.
(Srimad Bhagavatam-----7:5:23-24-----purport).

According to Vedic civilization, the ultimate perfection of life is to take sannyāsa, but at the present moment people do not know why sannyāsa is accepted. Because of misunderstanding, they think that one accepts sannyāsa to escape social responsibilities. But one does not accept sannyāsa to escape from responsibility to society. Generally one accepts sannyāsa at the fourth stage of spiritual life. One begins as a brahmacārī then becomes a gṛhastha, a vānaprastha and finally a sannyāsī to take advantage of the duration of one's life by engaging oneself fully in self-realization. Sannyāsa does not mean begging from door to door to accumulate money for sense gratification. However, because in Kali-yuga people are more or less prone to sense gratification, immature sannyāsa is not recommended.
(Srimad Bhagavatam-----7:13:34-----purport).

Every householder should be very careful because even though a householder may try to conquer the senses, he becomes a victim to the association of relatives and falls down. Thus a gṛhastha must become a vānaprastha or sannyāsī, live in a secluded place, and be satisfied with food gotten by begging from door to door. He must chant the oṁkāra mantra or Hare Kṛṣṇa mantra, and in this way he will perceive transcendental bliss within himself. After taking sannyāsa, however, if one returns to gṛhastha life, he is called a vāntāśī, which means "one who eats his own vomit." Such a person is shameless. A householder should not give up the ritualistic ceremonies, and a sannyāsī should not live in society. If a sannyāsī is agitated by the senses, he is a cheater influenced by the modes of passion and ignorance. When one assumes a role in goodness by starting philanthropic and altruistic activities, such activities become impediments on the path of devotional service.
(Srimad Bhagavatam-----7:15-----summary).

Materialistic activities are regulated by the institution of varṇāśrama-dharma. Without varṇāśrama-dharma, materialistic activities constitute animal life. Yet even in human life, while observing the principles of varṇa and āśrama-brāhmaṇa, kṣatriya, vaiśya, śūdra, brahmacarya, gṛhastha, vānaprastha and sannyāsa—one must ultimately accept sannyāsa, the renounced order, for only by the renounced order can one be situated in brahma-sukha, or transcendental bliss. In brahma-sukha one is no longer attracted by lusty desires. Indeed, when one is no longer disturbed, especially by lusty desires for sexual indulgence, he is fit to become a sannyāsī. Otherwise, one should not accept the sannyāsa order. If one accepts sannyāsa at an immature stage, there is every possibility of his being attracted by women and lusty desires and thus again becoming a so-called gṛhastha or a victim of women. Such a person is most shameless, and he is called vāntāśī, or one who eats that which he has already vomited. He certainly leads a condemned life. In our Kṛṣṇa consciousness movement it is advised, therefore, that the sannyāsīs and brahmacārīs keep strictly aloof from the association of women so that there will be no chance of their falling down again as victims of lusty desires.
(Srimad Bhagavatam-----7:15:36-----purport).

Once upon a time, Sudyumna went on tour with his ministers. At the foot of the mountain Sumeru there is a forest named Sukumāra, and as soon as they entered that forest, they were all transformed into women. When Mahārāja Parīkṣit inquired from Śukadeva Gosvāmī about the reason for this transformation, Śukadeva Gosvāmī described how Sudyumna, being transformed into a woman, accepted Budha, the son of the moon, as her husband and had a son named Purūravā. By the grace of Lord Śiva, Sudyumna received the benediction that he would live one month as a woman and one month as a man. Thus he regained his kingdom and had three sons, named Utkala, Gaya and Vimala, who were all very religious. Thereafter, he entrusted his kingdom to Purūravā and took the order of vānaprastha life.
(Srimad Bhagavatam-----9:1-----summary).

Persons who live in the village or town are called grāma-nivāsī, and those who live in the forest are called vana-vāsī or vānaprastha. The vānaprasthas, who have retired from family life, generally lament about their past family life because it engaged them in trying to fulfill lusty desires. Prahlāda Mahārāja said that one should retire from family life as soon as possible, and he described family life as the darkest well (hitvātma-pātaṁ gṛham andha-kūpam). If one continuously or permanently concentrates on living with his family, he should be understood to be killing himself. In the Vedic civilization, therefore, it is recommended that one retire from family life at the end of his fiftieth year and go to vana, the forest. When he becomes expert or accustomed to forest life, or retired life as a vānaprastha, he should accept sannyāsa. Vanaṁ gato yad dharim āśrayeta (S.B.7:5:5). Sannyāsa means accepting unalloyed engagement in the service of the Lord. Vedic civilization therefore recommends four different stages of life-brahmacarya, gṛhastha, vānaprastha and sannyāsa. One should be very much ashamed of remaining a householder and not promoting oneself to the two higher stages, namely vānaprastha and sannyāsa.
(Srimad Bhagavatam-----9:19:2-----purport).