While the bhakti creeper is growing, the devotee must protect it by fencing it all around. The neophyte devotee must be protected by being surrounded by pure devotees. In this way he will not give the maddened elephant a chance to uproot his bhakti creeper. When one associates with nondevotees, the maddened elephant is set loose. Śrī Caitanya Mahāprabhu has said, asat-saṅga-tyāga,—ei vaiṣṇava-ācāra (CC.2:22:87). The first business of a Vaiṣṇava is to give up the company of nondevotees. A so-called mature devotee, however, commits a great offense by giving up the company of pure devotees. The human being is a social animal, and if one gives up the society of pure devotees, he must associate with nondevotees (asat-saṅga). By contacting nondevotees and engaging in nondevotional activities, a so-called mature devotee will fall victim to the mad elephant offense. Whatever growth has taken place is quickly uprooted by such an offense. One should therefore be very careful to defend the creeper by fencing it in—that is, by following the regulative principles and associating with pure devotees.
(Sri Caitanya Caritamrta------2:19:157------purport).

The importance of discussing Śrīmad-Bhāgavatam in the society of pure devotees was explained by Śaunaka Muni during the meeting at Naimiṣāraṇya, in the presence of Sūta Gosvāmī. Sūta Gosvāmī confirmed that if someone is fortunate enough to associate with a pure devotee of the Lord even for a moment, that particular moment is so valuable that even those pious activities which can promote one to the heavenly planets or give liberation from material miseries cannot compare to it. In other words, those who are attached to Śrīmad-Bhāgavatam do not care for any kind of benefit derived from elevation to the higher planetary kingdoms, or for the liberation which is conceived of by the impersonalists. As such, the association of pure devotees is so transcendentally valuable that no kind of material happiness can compare to it.
(Nectar of Devotion).

Vaiṣṇavas, or devotees, are usually very compassionate upon conditioned souls. Without even being invited, a devotee will go from door to door to enlighten people and to bring them out of the darkness of nescience by injecting knowledge of the living entity's constitutional position as a servant of Lord Kṛṣṇa. Such devotees are empowered by the Lord to distribute devotional consciousness, or Kṛṣṇa consciousness, to the people in general. They are known as authorized spiritual masters, and it is by their mercy that a conditioned soul gets the seed of devotional service. The causeless mercy of the Supreme Personality of Godhead is first appreciated when one comes in touch with a bona fide spiritual master who can bring the conditioned soul to the highest position of devotional life. Therefore Lord Caitanya said that by the mercy of the spiritual master one can achieve the causeless mercy of the Lord, and by the mercy of the Supreme Personality of Godhead, one can attain the mercy of the bona fide spiritual master.
Thus by the mercy of the spiritual master and Kṛṣṇa, one receives the seed of devotional service. He has only to sow the seed in the field of his heart, just as a gardener sows the seed of a valuable tree. After sowing this seed, one has to water it in the form of chanting and hearing the holy name of the Supreme Lord or by taking part in discussions about the science of devotional service in a society of pure devotees. When the plant of devotional service sprouts up from the seed of devotion, it begins to grow freely. When it is full grown, it surpasses the length and breadth of this universe and enters into the transcendental atmosphere, where everything is bathed in the effulgence of the brahmajyoti. The plant even penetrates this brahmajyoti and gradually enters the planet known as Goloka Vṛndāvana. There the plant takes shelter at the lotus feet of Kṛṣṇa. That is the ultimate goal of devotional service. After attaining this position, the plant produces fruit, which is known as the fruit of love of Godhead. However, it is necessary for the devotee, or transcendental gardener, to pour water on the plant daily by chanting and hearing. Unless one waters the plant by chanting and hearing, there is every chance that it will dry up.

(Teachings of Lord Caitanya).