In the Seventh Canto of Śrīmad-Bhāgavatam, Thirteenth Chapter, verse 8, Nārada Muni, while discussing with Mahārāja Yudhiṣṭhira the various functions of the different orders in society, especially mentions rules for the sannyāsīs, those persons who have renounced this material world. One who has accepted the sannyāsa order of life is forbidden to accept as a disciple anyone who is not fit. A sannyāsī should first of all examine whether a prospective student is sincerely seeking Kṛṣṇa consciousness. If he is not, he should not be accepted. However, Lord Caitanya's causeless mercy is such that He advised all bona fide spiritual masters to speak about Kṛṣṇa consciousness everywhere. Therefore, in the line of Lord Caitanya even the sannyāsīs can speak about Kṛṣṇa consciousness everywhere, and if someone is seriously inclined to become a disciple, the sannyāsī always accepts him.
The one point is that without increasing the number of disciples, there is no propagation of the cult of Kṛṣṇa consciousness. Therefore, sometimes even at a risk, a sannyāsī in the line of Caitanya Mahāprabhu may accept even a person who is not thoroughly fit to become a disciple. Later on, by the mercy of such a bona fide spiritual master, the disciple is gradually elevated. However, if one increases the number of disciples simply for some prestige or false honor, he will surely fall down in the matter of executing Kṛṣṇa consciousness.