The tridaṇḍi-sannyāsī of the Vaiṣṇava school accepts three rods, representing the vow to engage in the service of the Lord with body, mind and speech, whereas the ekadaṇḍi-sannyāsī takes the vow to become one with the Supreme. Since the Lord is the Absolute, there is no distinction between Him and His glories. The glories of the Lord as chanted by the Vaiṣṇava sannyāsī are as substantial as the Lord Himself, and thus while glorifying the Lord the devotee becomes one with Him in transcendental interest, although he remains eternally a transcendental servitor. This simultaneously one and different position of the devotee makes him eternally purified, and thus his life becomes a complete success.
(Srimad Bhagavatam----3:6:37----purport).

According to the Vedic system, a sannyāsī, a person in the renounced order of life, is dressed in saffron-colored garments. This saffron dress is practically a passport for the mendicant and sannyāsī to go anywhere. The sannyāsī's duty is to enlighten people in Kṛṣṇa consciousness. Those in the renounced order of life have no other business but preaching the glories and supremacy of the Supreme Personality of Godhead. Therefore the Vedic sociological conception is that a sannyāsī should not be restricted; he is allowed to go anywhere and everywhere he wants, and he is not refused any gift he might demand from a householder.
(Srimad Bhagavatam----3:15:31----purport).

A sannyāsī, one in the renounced order of life, is meant to give enlightenment to the people. He should travel, going from home to home to enlighten. The householder, by the spell of māyā, becomes absorbed in family affairs and forgets his relationship with Kṛṣṇa. If he dies in forgetfulness, like the cats and dogs, then his life is spoiled. It is the duty of a sannyāsī, therefore, to go and awaken the forgetful souls with enlightenment of their eternal relationship with the Lord and to engage them in devotional service. The devotee should show mercy to the fallen souls and also give them the assurance of fearlessness. As soon as one becomes a devotee of the Lord, he is convinced that he is protected by the Lord. Fear itself is afraid of the Lord; therefore, what has he to do with fearfulness?
(Srimad Bhagavatam----3:21:31----purport).

To award fearlessness to the common man is the greatest act of charity. A sannyāsī, or one who is in the renounced order of life, should wander from door to door, from village to village, from town to town and from country to country, all over the world as far as he is able to travel, and enlighten the householders about Kṛṣṇa consciousness. A person who is a householder but is initiated by a sannyāsī has the duty to spread Kṛṣṇa consciousness at home; as far as possible, he should call his friends and neighbors to his house and hold classes in Kṛṣṇa consciousness. Holding a class means chanting the holy name of Kṛṣṇa and speaking from Bhagavad-gītā or Śrīmad-Bhāgavatam. There are immense literatures for spreading Kṛṣṇa consciousness, and it is the duty of each and every householder to learn about Kṛṣṇa from his sannyāsī spiritual master. There is a division of labor in the Lord's service. The householder's duty is to earn money because a sannyāsī is not supposed to earn money but is completely dependent on the householder.
(Srimad Bhagavatam----3:21:31----purport).

Actually, sannyāsa, or renunciation of material household life, necessitates complete absorption in Kṛṣṇa consciousness and immersion in the self. One does not takesannyāsa, freedom from family responsibility in the renounced order of life, to make another family or to create an embarrassing transcendental fraud in the name of sannyāsa. Thesannyāsī's business is not to become proprietor of so many things and amass money from the innocent public. A sannyāsī is proud that he is always thinking of Kṛṣṇa within himself. Of course, there are two kinds of devotees of the Lord. One is called goṣṭhy-ānandī, which means those who are preachers and have many followers for preaching the glories of the Lord and who live among those many, many followers just to organize missionary activities. Other devotees are ātmānandī, or self-satisfied, and do not take the risk of preaching work. They remain, therefore, alone with God. In this classification was Kardama Muni. He wanted to be free from all anxieties and remain alone within his heart with the Supreme Personality of Godhead. Parivrāja means "an itinerant mendicant." A mendicant sannyāsī should not live anywhere for more than three days. He must be always moving because his duty is to move from door to door and enlighten people about Kṛṣṇa consciousness.
(Srimad Bhagavatam----3:24:34----purport).

In this age of Kali-yuga sannyāsa is prohibited because persons in this age are all śūdras and cannot follow the rules and regulations of sannyāsa life. It is very commonly found that so-called sannyāsīs are addicted to nonsense—even to having private relationships with women. This is the abominable situation in this age. Although they dress themselves as sannyāsīs, they still cannot free themselves from the four principles of sinful life, namely illicit sex life, meat-eating, intoxication and gambling. Since they are not freed from these four principles, they are cheating the public by posing as svāmīs.
In Kali-yuga the injunction is that no one should accept sannyāsa. Of course, those who actually follow the rules and regulations must take sannyāsa. Generally, however, people are unable to accept sannyāsa life, and therefore Caitanya Mahāprabhu stressed, kalau nāsty eva nāsty eva na-sty eva gatir anyathā. In this age there is no other alternative, no other alternative, no other alternative than to chant the holy name of the Lord: Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare. The main purpose of sannyāsa life is to be in constant companionship with the Supreme Lord, either by thinking of Him within the heart or hearing of Him through aural reception.
(Srimad Bhagavatam----3:24:35----purport).

A person in the renounced order of life, a sannyāsī, is also called a sādhu because he renounces everything—his home, his comfort, his friends, his relatives, and his duties to friends and to family. He renounces everything for the sake of the Supreme Personality of Godhead. A sannyāsī is generally in the renounced order of life, but his renunciation will be successful only when his energy is employed in the service of the Lord with great austerity.
(Srimad Bhagavatam----3:25:22----purport).

Since time immemorial, the sannyāsa order has carried the tridaṇḍa. Later Śaṅkarācārya introduced the ekadaṇḍi-sannyāsa. A tridaṇḍi-sannyāsī is a Vaiṣṇava sannyāsī, and an ekadaṇḍi-sannyāsī is a Māyāvādī sannyāsī. There are many other types of sannyāsīs, who are not approved by Vedic rituals. A type of pseudo-sannyāsa was introduced by Indra when he tried to hide himself from the attack of Vijitāśva, the great son of King Pṛthu. Now there are many different types of sannyāsīs. Some of them go naked, and some of them carry a skull and trident, generally known as kāpālika. All of them were introduced under some meaningless circumstances, and those who have a poor fund of knowledge accept these false sannyāsīs and their pretenses, although they are not bona fide guides to spiritual advancement. At the present moment some missionary institutions, without referring to the Vedic rituals, have introduced some sannyāsīs who engage in sinful activities. The sinful activities forbidden by the śāstras are illicit sex, intoxication, meat-eating and gambling. These so-called sannyāsīs indulge in all these activities. They eat meat and flesh, fish, eggs and just about everything. They sometimes drink with the excuse that without alcohol, fish and meat, it is impossible to remain in the cold countries near the Arctic zone. These sannyāsīs introduce all these sinful activities in the name of serving the poor, and consequently poor animals are cut to pieces and go into the bellies of these sannyāsīs. As described in the following verses, such sannyāsīs are pākhaṇḍīs. Vedic literature states that a person who puts Lord Nārāyaṇa on the level with Lord Śiva or Lord Brahmā immediately becomes a pākhaṇḍī.
(Srimad Bhagavatam----3:19:22----purport).

The paramahaṁsa stage is the topmost position in renounced life. In sannyāsa, the renounced order, there are four stages—kuṭīcaka, bahūdaka, parivrājakācārya and paramahaṁsa. According to the Vedic system, when one accepts the renounced order, he stays outside his village in a cottage, and his necessities, especially his food, are supplied from home. This is called the kuṭīcaka stage. When a sannyāsī advances further, he no longer accepts anything from home: instead, he collects his necessities, especially his food, from many places. This system is called mādhukarī, which literally means "the profession of the bumblebees." As bumblebees collect honey from many flowers, a little from each, so a sannyāsī should beg from door to door but not accept very much food from any particular house; he should collect a little bit from every house. This is called the bahūdaka stage. When a sannyāsī is still more experienced, he travels all over the world to preach the glories of Lord Vāsudeva. He is then known as parivrājakācārya. The sannyāsī reaches the paramahaṁsa stage when he finishes his preaching work and sits down in one place, strictly for the sake of advancing in spiritual life. An actual paramahaṁsa is one who completely controls his senses and engages in the unalloyed service of the Lord.
(Srimad Bhagavatam----5:1:27----purport).

For paramahaṁsas, or sannyāsīs in the Vaiṣṇava order, preaching is the first duty. To preach, such sannyāsīs may accept the symbols of sannyāsa, such as the daṇḍa and kamaṇḍalu, or sometimes they may not. Generally the Vaiṣṇava sannyāsīs, being paramahaṁsas, are automatically called bābājīs, and they do not carry a kamaṇḍalu or daṇḍa. Such a sannyāsī is free to accept or reject the marks of sannyāsa. His only thought is "Where is there an opportunity to spread Kṛṣṇa consciousness?" Sometimes the Kṛṣṇa consciousness movement sends its representative sannyāsīs to foreign countries where the daṇḍa and kamaṇḍalu are not very much appreciated. We send our preachers in ordinary dress to introduce our books and philosophy. Our only concern is to attract people to Kṛṣṇa consciousness. We may do this in the dress of sannyāsīs or in the regular dress of gentlemen. Our only concern is to spread interest in Kṛṣṇa consciousness.
(Srimad Bhagavatam----7:13:9----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 acceptssannyāsa 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).