The word ātmavatām is significant in this verse. There are three different kinds of devotees, namely kaniṣṭha-adhikārī, madhyama-adhikārī and uttama-adhikārī: the neophyte, the preacher and the mahā-bhāgavata, or the highly advanced devotee. The highly advanced devotee is one who knows the conclusion of the Vedas in full knowledge; thus he becomes a devotee. Indeed, not only is he convinced himself, but he can convince others on the strength of Vedic evidence. The advanced devotee can also see all other living entities as part and parcel of the Supreme Lord, without discrimination. The madhyama-adhikārī (preacher) is also well versed in the śāstras and can convince others also, but he discriminates between the favorable and the unfavorable. In other words, themadhyama-adhikārī does not care for the demoniac living entities, and the neophyte kaniṣṭha-adhikārī does not know much about śāstra but has full faith in the Supreme Personality of Godhead.
(Srimad Bhagavatam----4:22:16----purport).

This is a manifestation of real love for Kṛṣṇa and Lord Caitanya Mahāprabhu. There are three categories of Vaiṣṇavas: kaniṣṭha-adhikārīs, madhyama-adhikārīs and uttama-adhikārīs. The kaniṣṭha-adhikārī, or the devotee in the lowest stage of Vaiṣṇava life, has firm faith but is not familiar with the conclusions of the śāstras. The devotee in the second stage, the madhyama-adhikārī, is completely aware of the śāstric conclusion and has firm faith in his guru and the Lord. He, therefore, avoiding nondevotees, preaches to the innocent. However, the mahā-bhāgavata or uttama-adhikārī, the devotee in the highest stage of devotional life, does not see anyone as being against the Vaiṣṇava principles, for he regards everyone as a Vaiṣṇava but himself. This is the essence of Caitanya Mahāprabhu's instruction that one be more tolerant than a tree and think oneself lower than the straw in the street (tṛṇād api su-nīcena taror iva sahiṣṇunā). However, even if a devotee is in the uttama-bhāgavata status he must come down to the second status of life, madhyama-adhikārī, to be a preacher, for a preacher should not tolerate blasphemy against another Vaiṣṇava. Although a kaniṣṭha-adhikārī also cannot tolerate such blasphemy, he is not competent to stop it by citing śāstric evidences. Therefore Tapana Miśra and Candraśekhara are understood to be kaniṣṭha-adhikārīs because they could not refute the arguments of the sannyāsīs in Benares. They appealed to Lord Caitanya Mahāprabhu to take action, for they felt that they could not tolerate such criticism although they also could not stop it.
(Sri Caitanya Caritamrta----1:7:51----purport).

When a touchstone touches iron, it turns the iron to gold. Parvata Muni called Nārada Muni a touchstone because by his touch the hunter, who was the lowest among men, became an elevated and perfect Vaiṣṇava. Śrīla Bhaktivinoda Ṭhākura said that the position of a Vaiṣṇava can be tested by seeing how good a touchstone he is—that is, by seeing how many Vaiṣṇavas he has made during his life. A Vaiṣṇava should be a touchstone so that he can convert others to Vaiṣṇavism by his preaching, even though people may be fallen like the hunter. There are many so-called advanced devotees who sit in a secluded place for their personal benefit. They do not go out to preach and convert others into Vaiṣṇavas, and therefore they certainly cannot be called sparśa-maṇi, advanced devotees. Kaniṣṭha-adhikārī devotees cannot turn others into Vaiṣṇavas, but a madhyama-adhikārī Vaiṣṇava can do so by preaching. Śrī Caitanya Mahāprabhu advised His followers to increase the numbers of Vaiṣṇavas.
yāre dekha, tāre kaha "kṛṣṇa"-upadeśa
āmāra ājñāya guru hañā tāra' ei deśa
(cc.2:7:128)
It is Śrī Caitanya Mahāprabhu's wish that everyone should become a Vaiṣṇava and guru. Following the instructions of Śrī Caitanya Mahāprabhu and His disciplic succession, one can become a spiritual master, for the process is very easy. One can go everywhere and anywhere to preach the instructions of Kṛṣṇa. The Bhagavad-gītā is Kṛṣṇa's instructions; therefore the duty of every Vaiṣṇava is to travel and preach the Bhagavad-gītā, either in his country or a foreign country. This is the test of sparśa-maṇi, following in the footsteps of Nārada Muni.
(Sri Caitanya Caritamrta----2:24:277----purport).

One should submissively receive the transcendental messages from spiritually advanced sources and chant the very same messages for one's own benefit as well as the benefit of one's audience.
When Brahmā described the situation of pure devotees freed from the culture of empiric philosophy and fruitive actions, he recommended the process of hearing from persons who are on the path of devotion. Following in the footsteps of such liberated souls, who are able to vibrate real transcendental sound, can lead one to the highest stage of devotion, and thus one can become a mahā-bhāgavata. From the teachings of Lord Caitanya Mahāprabhu to Sanātana Gosvāmī (cc.2:22:65) we learn:
śāstra-yuktye sunipuṇa, dṛḍha-śraddhā yāṅra
"uttama-adhikārī" sei tāraye saṁsāra
"A person who is expert in understanding the conclusion of the revealed scriptures and who fully surrenders to the cause of the Lord is actually able to deliver others from the clutches of material existence." Śrīla Rūpa Gosvāmī, in his Upadeśāmṛta (3), advises that to make rapid advancement in the cult of devotional service one should be very active and should persevere in executing the duties specified in the revealed scriptures and confirmed by the spiritual master. Accepting the path of liberated souls and the association of pure devotees enriches such activities.
(Sri Caitanya Caritamrta----1:2:117----purport).

This is a manifestation of real love for Kṛṣṇa and Lord Caitanya Mahāprabhu. There are three categories of Vaiṣṇavas: kaniṣṭha-adhikārīs, madhyama-adhikārīs anduttama-adhikārīs. The kaniṣṭha-adhikārī, or the devotee in the lowest stage of Vaiṣṇava life, has firm faith but is not familiar with the conclusions of the śāstras. The devotee in the second stage, the madhyama-adhikārī, is completely aware of the śāstric conclusion and has firm faith in his guru and the Lord. He, therefore, avoiding nondevotees, preaches to the innocent. However, the mahā-bhāgavata or uttama-adhikārī, the devotee in the highest stage of devotional life, does not see anyone as being against the Vaiṣṇava principles, for he regards everyone as a Vaiṣṇava but himself. This is the essence of Caitanya Mahāprabhu's instruction that one be more tolerant than a tree and think oneself lower than the straw in the street (tṛṇād api su-nīcena taror iva sahiṣṇunā). However, even if a devotee is in the uttama-bhāgavata status he must come down to the second status of life, madhyama-adhikārī, to be a preacher, for a preacher should not tolerate blasphemy against another Vaiṣṇava.
(Sri Caitanya Caritamrta----1:7:51----purport).

"A person who has attained firm faith is a real candidate for advancing in Kṛṣṇa consciousness. According to the faith, there are first-class, second-class and neophyte devotees. One who has preliminary faith is called a kaniṣṭha-adhikārī, or a neophyte. The neophyte, however, can become an advanced devotee if he strictly follows the regulative principles set down by the spiritual master. Therefore it is on the basis of faith and attachment to Kṛṣṇa that one can judge who is a madhyama-adhikārī or an uttama-adhikārī." (Cc. Madhya 22.64, 69, 71)
It is thus concluded that even a neophyte devotee is superior to the karmīs and jñānīs because he has full faith in chanting the holy name of the Lord. A karmī or a jñānī, regardless of his greatness, has no faith in Lord Viṣṇu, His holy name or His devotional service. One may be advanced religiously, but if he is not trained in devotional service, he has very little credit on the transcendental platform. Even a neophyte devotee engaged in Deity worship in accordance with the regulations set forth by the spiritual master is in a position superior to that of the fruitive worker and speculative philosopher.
(Sri Caitanya Caritamrta----2:15:106----purport).

Although preaching is not meant for a mahā-bhāgavata, a mahā-bhāgavata can descend to the platform of madhyama-bhāgavata just to convert others to Vaiṣṇavism. Actually a mahā-bhāgavata is fit to spread Kṛṣṇa consciousness, but he does not distinguish where Kṛṣṇa consciousness should be spread from where it should not. He thinks that everyone is competent to accept Kṛṣṇa consciousness if the chance is provided. A neophyte and an intermediate devotee should always be eager to hear the mahā-bhāgavata and serve him in every respect. The neophyte and intermediate devotees can gradually rise to the platform of uttama-adhikārī and become first-class devotees. Symptoms of a first-class devotee are given in Śrīmad-Bhāgavatam (11.2.45):
sarva-bhūteṣu yaḥ paśyed bhagavad-bhāvam ātmanaḥ
bhūtāni bhagavaty ātmany eṣa bhāgavatottamaḥ
"The most advanced devotee sees within everything the soul of all souls, the Supreme Personality of Godhead, Śrī Kṛṣṇa. Consequently, he sees systematically everything in relation to the Supreme Lord and understands that everything that exists is eternally situated within the Lord."
(Sri Caitanya Caritamrta----2:16:74----purport).

"The most advanced devotee sees within everything the soul of all souls, the Supreme Personality of Godhead, Śrī Kṛṣṇa. Consequently, he sees systematically everything in relation to the Supreme Lord and understands that everything that exists is eternally situated within the Lord."
When teaching Sanātana Gosvāmī, the Lord further said:
śāstra-yuktye sunipuṇa, dṛḍha-śraddhā yāṅra
"uttama-adhikārī" se tāraye saṁsāra
"One who is expert in the Vedic literature and has full faith in the Supreme Lord is an uttama-adhikārī, a first-class Vaiṣṇava, a topmost Vaiṣṇava who can deliver the whole world and turn everyone to Kṛṣṇa consciousness." (cc.2:22:65) With great love and affection, the mahā-bhāgavata observes the Supreme Personality of Godhead, devotional service and the devotee. He observes nothing beyond Kṛṣṇa, Kṛṣṇa consciousness and Kṛṣṇa's devotees. The mahā-bhāgavata knows that everyone is engaged in the Lord's service in different ways. He therefore descends to the middle platform to elevate everyone to the Kṛṣṇa conscious position.
(Sri Caitanya Caritamrta----2:16:74----purport).

When he is free and transcendental to mixed devotional activity, he becomes a second-class devotee. When he becomes expert in logic and can refer to the śāstras, he becomes a first-class devotee. The devotees are also described as positive, comparative and superlative in terms of their love and attachment for Kṛṣṇa.
It should be understood that a madhyama-adhikārī, a second-class devotee, is fully convinced of Kṛṣṇa consciousness but cannot support his convictions with śāstric reference. A neophyte may fall down by associating with nondevotees because he is not firmly convinced and strongly situated. The second-class devotee, even though he cannot support his position with śāstric reference, can gradually become a first-class devotee by studying the śāstras and associating with a first-class devotee. However, if the second-class devotee does not advance himself by associating with a first-class devotee, he makes no progress. There is no possibility that a first-class devotee will fall down, even though he may mix with nondevotees to preach. Conviction and faith gradually increase to make one an uttama-adhikārī, a first-class devotee.
(Sri Caitanya Caritamrta----2:22:72----purport).