There are many inexperienced persons who advocate self-realization without the help of a spiritual master. They decry the necessity of the spiritual master and try themselves to take his place by propagating the theory that a spiritual master is not necessary. Srimad-Bhagavatam, however, does not approve this viewpoint. Even the great transcendental scholar Vyasadeva had need of a spiritual master, and under the instruction of his spiritual master, Narada, he prepared this sublime literature, Srimad-Bhagavatam. Even Lord Caitanya, although He is Krsna Himself, accepted a spiritual master; even Lord Krsna accepted a spiritual master, Sandipani Muni, in order to be enlightened; and all the acaryas and saints of the world had spiritual masters. In Bhagavad-gita Arjuna accepted Lord Krsna as his spiritual master, although there was no necessity of such a formal declaration. So, in all cases, there is no question about the necessity of accepting a spiritual master. The only stipulation is that the spiritual master should be bona fide; i.e., the spiritual master must be in the proper chain of disciplic succession, called the parampara system.
(SRIMAD BHAGAVATAM-------3:7:39------PURPORT).

We shall eternally enjoy the relationship with the Supreme Lord in different aspects. A special feature of this verse is the acceptance of the Supreme Lord as the supreme preceptor. Bhagavad-gītā was spoken directly by the Supreme Lord, and Arjuna accepted Kṛṣṇa as guru, or spiritual master. Similarly, we should accept only Kṛṣṇa as the supreme spiritual master.
(SRIMAD BHAGAVATAM-------3:25:38------PURPORT).

Arjuna accepted Krsna as his spiritual master (sisyas te 'ham sadhi mam tvam prapannam (B.G.2:7), and Krsna sometimes chastised him. For example, the Lord said, asocyan anvasocas tvam prajna-vadams ca bhasase: (B.2:11) "while speaking learned words, you are mourning for what is not worthy of grief." The Lord also said, kutas tva kasmalam idam visame samupasthitam: "My dear Arjuna, how have these impurities come upon you?" Such was the intimate relationship between the Pandavas and Krsna. In the same way, a pure devotee of the Lord is always with Krsna through thick and thin; his way of life is Krsna. This is the statement of the authority Sri Narada Muni.
(SRIMAD BHAGAVATAM-------7:10:49------PURPORT).

Sometimes less intelligent men ask whether one has to approach a guru to be instructed in devotional service for spiritual advancement. The answer is given here -- indeed, not only here, but also in Bhagavad-gita, where Arjuna accepted Krsna as his guru (sisyas te 'ham sadhi mam tvam prapannam (B.G.2:7). The Vedas also instruct, tad-vijnanartham sa gurum evabhigacchet: (MU 1.2.12) one must accept a guru for proper direction if one is seriously inclined toward advancement in spiritual life. The Lord says that one must worship the acarya, who is the representative of the Supreme Personality of Godhead (acaryam mam vijaniyat (S.B.11:17:27). One should definitely understand this. In Caitanya-caritamrta it is said that the guru is the manifestation of the Supreme Personality of Godhead. Therefore, according to all the evidence given by the sastra and by the practical behavior of devotees, one must accept a guru. Aditi accepted her husband as her guru, so that he would direct her how to advance in spiritual consciousness, devotional service, by worshiping the Supreme Lord.
(SRIMAD BHAGAVATAM-------8:6:23------PURPORT).

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