Sometimes it is argued that people do not know who is a spiritual master and that finding a spiritual master from whom to get enlightenment in regard to the destination of life is very difficult. To answer all these questions, King Satyavrata shows us the way to accept the Supreme Personality of Godhead as the real spiritual master. The Supreme Lord has given full directions in Bhagavad-gītā about how to deal with everything in this material world and how to return home, back to Godhead. Therefore, one should not be misled by so-called gurus who are rascals and fools. Rather, one should directly see the Supreme Personality of Godhead as the guru or instructor. It is difficult, however, to understand Bhagavad-gītā without the help of the guru. Therefore the guru appears in the paramparā system. In Bhagavad-gītā (4.34) the Supreme Personality of Godhead recommends:
tad viddhi praṇipātena
paripraśnena sevayā
upadekṣyanti te jñānaṁ
jñāninas tattva-darśinaḥ
"Just try to learn the truth by approaching a spiritual master. Inquire from him submissively and render service unto him. The self-realized soul can impart knowledge unto you because he has seen the truth." Lord Kṛṣṇa directly instructed Arjuna. Arjuna is therefore tattva-darśī or guru. Arjuna accepted the Supreme Personality of Godhead (paraṁ brahma paraṁ dhāma pavitraṁ paramaṁ bhavān (B.G.10:12). Similarly, following in the footsteps of Śrī Arjuna, who is a personal devotee of the Lord, one should accept the supremacy of Lord Kṛṣṇa, as supported by Vyāsa, Devala, Asita, Nārada and later by the ācāryas Rāmānujācārya, Madhvācārya, Nimbārka and Viṣṇu Svāmī and still later by the greatest ācārya, Śrī Caitanya Mahāprabhu. Where, then, is the difficulty in finding a guru? If one is sincere he can find the guru and learn everything. One should take lessons from the guru and find out the goal of life. Mahārāja Satyavrata, therefore, shows us the way of the mahājana. Mahājano yena gataḥ sa panthāḥ (CC.2:17:186). One should surrender to the Supreme Personality of Godhead (daśāvatāra) and learn from Him about the spiritual world and the goal of life.
(Srimad Bhagavatam----8:24:53----purport).

Unless delivered or blessed by a devotee, one cannot realize that Kṛṣṇa is the Supreme Personality of Godhead. Manuṣyāṇāṁ sahasreṣu kaścid yatati siddhaye. According to this verse of Bhagavad-gītā (7.3), there are so many siddhas or yogīs who cannot understand Kṛṣṇa; instead, they misunderstand Him. But if one takes shelter of a devotee descending from the paramparā system of Nārada (svayambhūr nāradaḥ śambhuḥ (S.B.6:3:20), one can then understand who is an incarnation of the Supreme Personality of Godhead. In this age, many pseudo incarnations are advertised simply for having exhibited some magical performances, but except for persons who are servants of Nārada and other servants of Kṛṣṇa, no one can understand who is God and who is not. This is confirmed by Narottama dāsa Ṭhākura. Chāḍiyā vaiṣṇava-sevā nistāra pāyeche kebā: no one is delivered from the material conception of life unless favored by a Vaiṣṇava. Others can never understand, neither by speculation nor by any other bodily or mental gymnastics.
(Srimad Bhagavatam----10:10:37----purport).

With one's limited senses, one cannot argue about that which is inconceivable. Therefore the inconceivable is called acintya, that which is beyond cintya, our thoughts and arguments. Acintya refers to that which we cannot contemplate but have to accept. Śrīla Jīva Gosvāmī has said that unless we accept acintya in the Supreme, we cannot accommodate the conception of God. This must be understood. Therefore we say that the words of śāstra should be taken as they are, without change, since they are beyond our arguments. Acintyāḥ khalu ye bhāvā na tāṁs tarkeṇa yojayet: "That which is acintya cannot be ascertained by argument." People generally argue, but our process is not to argue but to accept the Vedic knowledge as it is. When Kṛṣṇa says, "This is superior, and this is inferior," we accept what He says. It is not that we argue, "Why is this superior and that inferior?" If one argues, for him the knowledge is lost.
This path of acceptance is called avaroha-panthā The word avaroha is related to the word avatāra, which means"that which descends." The materialist wants to understand everything by the āroha-panthā—by argument and reason—but transcendental matters cannot be understood in this way. Rather, one must follow the avaroha-panthā, the process of descending knowledge. Therefore one must accept the paramparā system.
(Srimad Bhagavatam----10:13:57----purport).

In the paramparā system, the instructions taken from the bona fide spiritual master must also be based on revealed Vedic scriptures. One who is in the line of disciplic succession cannot manufacture his own way of behavior. There are many so-called followers of the Vaiṣṇava cult in the line of Caitanya Mahāprabhu who do not scrupulously follow the conclusions of the śāstras, and therefore they are considered to be apa-sampradāya, which means "outside of the sampradāya." Some of these groups are known as āula, bāula, kartābhajā, neḍā, daraveśa, sāṅi, sahajiyā, sakhībhekī, smārta, jāta-gosāñi, ativāḍī, cūḍādhārī and gaurāṅga-nāgarī. In order to follow strictly the disciplic succession of Lord Caitanya Mahāprabhu, one should not associate with these apasampradāya communities.
One who is not taught by a bona fide spiritual master cannot understand the Vedic literature. To emphasize this point, Lord Kṛṣṇa, while instructing Arjuna, clearly said that it was because Arjuna was His devotee and confidential friend that he could understand the mystery of the Bhagavad-gītā. It is to be concluded, therefore, that one who wants to understand the mystery of revealed scriptures must approach a bona fide spiritual master, hear from him very submissively and render service to him. Then the import of the scriptures will be revealed.
(Sri Caitanya Caritamrta----1:7:48----purport).

The principles of the paramparā system were strictly honored in previous ages—Satya-yuga, Tretā-yuga and Dvāpara-yuga—but in the present age, Kali-yuga, people neglect the importance of this system of śrauta-paramparā, or receiving knowledge by disciplic succession. In this age, people are prepared to argue that they can understand that which is beyond their limited knowledge and perception through so-called scientific observations and experiments, not knowing that actual truth comes down to man from authorities. This argumentative attitude is against the Vedic principles, and it is very difficult for one who adopts it to understand that the holy name of Kṛṣṇa is as good as Kṛṣṇa Himself. Since Kṛṣṇa and His holy name are identical, the holy name is eternally pure and beyond material contamination. It is the Supreme Personality of Godhead as a transcendental vibration. The holy name is completely different from material sound, as confirmed by Narottama dāsa Ṭhākura: golokera prema-dhana, hari-nāma-saṅkīrtana. The transcendental vibration of hari-nāma-saṅkīrtana is imported from the spiritual world. Thus although materialists who are addicted to experimental knowledge and the so-called "scientific method" cannot place their faith in the chanting of the Hare Kṛṣṇa mahā-mantra, it is a fact that simply by chanting the Hare Kṛṣṇa mantra offenselessly one can be freed from all subtle and gross material conditions.
(Sri Caitanya Caritamrta----1:7:74----purport).

All the activities of Śrī Caitanya Mahāprabhu were noted by His personal secretary Svarūpa Dāmodara and repeated to Raghunātha dāsa Gosvāmī, who memorized them. Whatever Kṛṣṇadāsa Kavirāja Gosvāmī heard is recorded in Śrī Caitanya-caritāmṛta. This is called the paramparā system, from Śrī Caitanya Mahāprabhu to Svarūpa Dāmodara to Raghunātha dāsa Gosvāmī to Kavirāja Gosvāmī. Kṛṣṇadāsa Kavirāja Gosvāmī has distributed this information in his book Caitanya-caritāmṛta. In other words, Śrī Caitanya-caritāmṛta is the essence of the instruction given through the paramparā system of the disciplic succession stemming from Śrī Caitanya Mahāprabhu.
(Sri Caitanya Caritamrta----2:2:84----purport).

Śrī Bhaktisiddhānta Sarasvatī Ṭhākura comments that all the Buddhist disciples were actually initiated by Śrī Caitanya Mahāprabhu into the chanting of the holy name of Kṛṣṇa, and when they chanted, they actually became different persons. At that time they were not Buddhists or atheists but Vaiṣṇavas. Consequently they immediately accepted Śrī Caitanya Mahāprabhu's order. Their original Kṛṣṇa consciousness was revived, and they were immediately able to chant Hare Kṛṣṇa and begin worshiping the Supreme Lord Viṣṇu.
It is the spiritual master who delivers the disciple from the clutches of māyā by initiating him into the chanting of the Hare Kṛṣṇa mahā-mantra. In this way a sleeping human being can revive his consciousness by chanting Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. In other words, the spiritual master awakens the sleeping living entity to his original consciousness so that he can worship Lord Viṣṇu. This is the purpose of dīkṣā, or initiation. Initiation means receiving the pure knowledge of spiritual consciousness.
One point to note in this regard is that the spiritual master of the Buddhists did not initiate his disciples. Rather, his disciples were initiated by Śrī Kṛṣṇa Caitanya Mahāprabhu, and they in turn were able to initiate their so-called spiritual master. This is the paramparā system. The so-called spiritual master of the Buddhists was actually in the position of a disciple, and after his disciples were initiated by Śrī Caitanya Mahāprabhu, they acted as his spiritual masters. This was possible only because the disciples of the Buddhist ācārya received the mercy of Lord Śrī Caitanya Mahāprabhu. Unless one is favored by Śrī Caitanya Mahāprabhu in the disciplic succession, one cannot act as a spiritual master. We should take the instructions of Śrī Caitanya Mahāprabhu, the spiritual master of the whole universe, to understand how one becomes a spiritual master and a disciple.
(Sri Caitanya Caritamrta----2:9:61----purport).