Spiritual master

One should not accept a spiritual master without following his instructions. Nor should one accept a spiritual master just to make a fashionable show of spiritual life. One must be jijñāsu, very much inquisitive to learn from the bona fide spiritual master. The inquiries one makes should strictly pertain to transcendental science (jijñāsuḥ śreya uttamam). The word uttamam refers to that which is above material knowledge. Tama means “the darkness of this material world,” and ut means “transcendental.” Generally people are very interested in inquiring about mundane subject matters, but when one has lost such interest and is simply interested in transcendental subject matters, he is quite fit for being initiated. When one is actually initiated by the bona fide spiritual master and when he seriously engages in the service of the Lord, he should be accepted as a madhyama-adhikārī. @Nectar of Instruction, Text 5

The great sage Śukadeva Gosvāmī was certainly inspired by Lord Kṛṣṇa to appear voluntarily before Mahārāja Parīkṣit, the great devotee of the Lord, just to give him the teachings of Śrīmad-Bhāgavatam. One can achieve the nucleus of the devotional service of the Lord by the mercy of the spiritual master and the Personality of Godhead. The spiritual master is the manifested representative of the Lord to help one achieve ultimate success. One who is not authorized by the Lord cannot become a spiritual master. Śrīla Śukadeva Gosvāmī is an authorized spiritual master, and thus he was inspired by the Lord to appear before Mahārāja Parīkṣit and instruct him in the teachings of Śrīmad-Bhāgavatam. One can achieve the ultimate success of going back to Godhead if he is favored by the Lord’s sending His true representative. As soon as a true representative of the Lord is met by a devotee of the Lord, the devotee is assured a guarantee for going back to Godhead just after leaving the present body. This, however, depends on the sincerity of the devotee himself. The Lord is seated in the heart of all living beings, and thus he knows very well the movements of all individual persons. As soon as the Lord finds that a particular soul is very eager to go back to Godhead, the Lord at once sends His bona fide representative. The sincere devotee is thus assured by the Lord of going back to Godhead. The conclusion is that to get the assistance and help of a bona fide spiritual master means to receive the direct help of the Lord Himself. @SB 1.19.36 purport

Unless one is perfectly anxious to inquire about the way of perfection, there is no necessity of approaching a spiritual master. A spiritual master is not a kind of decoration for a householder. Generally a fashionable materialist engages a so-called spiritual master without any profit. The pseudo spiritual master flatters the so-called disciple, and thereby both the master and his ward go to hell without a doubt. Mahārāja Parīkṣit is the right type of disciple because he puts forward questions vital to the interest of all men, particularly for the dying men. The question put forward by Mahārāja Parīkṣit is the basic principle of the complete thesis of Śrīmad-Bhāgavatam. Now let us see how intelligently the great master replies. @SB 1.19.37 purport