Therefore all learned and realized Vedic scholars speak with references to the incidents in the Purāṇas. Śrīla Rūpa Gosvāmī accepts the Purāṇas to be as important as the Vedas themselves. Therefore in Bhakti-rasāmṛta-sindhu he quotes the following verse from the Brahma-yāmala:
śruti-smṛti-purāṇādi-
pañcarātra-vidhiṁ vinā
aikāntikī harer bhaktir
utpātāyaiva kalpate
(Brs. 1.2.101)
"Devotional service of the Lord that ignores the authorized Vedic literatures like the Upaniṣads, purāṇas and Nārada Pañcarātra is simply an unnecessary disturbance in society." A devotee of Kṛṣṇa must refer not only to the Vedas, but also to the purāṇas. One should not foolishly consider the Purāṇas mythological. If they were mythological, Śukadeva Gosvāmī would not have taken the trouble to recite the old historical incidents concerning the life of Ajāmila. Now the history begins as follows.

(Srimad Bhagavatam-----6:1:20-----purport).

Pure devotees are described as sama-mati, which means that they never deviate from devotional service under any circumstances. It is not that devotees worship the Supreme Lord only when happy; they worship Him even when in distress. Happiness and distress do not hamper the process of devotional service. Therefore Śrīmad-Bhāgavatam says that devotional service is ahaituky apratihatā, unmotivated and uninterrupted. When a devotee offers devotional service to the Lord without any motive (anyābhilāṣitā-śūnyam (Bhakti-rasāmṛta-sindhu 1.1.11), his service cannot be hampered by any material condition (apratihatā). Thus a devotee who offers service in all conditions of life can conquer the Supreme Personality of Godhead.
(Srimad Bhagavatam-----6:16:34-----purport).

Only when one becomes spiritually saturated by transcendental service to the Lord are the transcendental name, form, quality and pastimes of the Lord revealed to him." (Bhakti-rasāmṛta-sindhu 1.2.234) If one takes to spiritual life under the direction of Nārada Muni or his representative and thus engages himself in the service of the Lord, he qualifies himself to see the Lord face to face. The Brahma-saṁhitā (5.38) states:
premāñjana-cchurita-bhakti-vilocanena
santaḥ sadaiva hṛdayeṣu vilokayanti
yaṁ śyāmasundaram acintya-guṇa-svarūpaṁ
govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
"I worship the primeval Lord, Govinda, who is always seen by the devotee whose eyes are anointed with the pulp of love. He is seen in His eternal form of Śyāmasundara situated within the heart of the devotee." One must follow the instructions of the spiritual master. Thus one becomes qualified and later sees the Supreme Personality of Godhead, as evinced by Mahārāja Citraketu.

(Srimad Bhagavatam-----6:16:50-----purport).

"A person who has broader intelligence, whether he is full of material desires, free from material desires, or desiring liberation, must by all means worship the supreme whole, the Personality of Godhead." (S.B.2:3:10) One should engage in full devotional service. Then, even though he has no desires, whatever desires he previously had can all be fulfilled simply by his worship of the Lord. The actual devotee does not desire even liberation (anyābhilāṣitā-śūnyam (Bhakti-rasāmṛta-sindhu 1.1.11)). The Lord, however, fulfills the desire of the devotee by awarding him opulence that will never be destroyed. A karmī's opulence is destroyed, but the opulence of a devotee is never destroyed. A devotee becomes more and more opulent as he increases his devotional service to the Lord.

(Srimad Bhagavatam-----6:18:74-----purport).

This is the difference between devotional service and all other methods of perfection. One who performs severe austerities for sense gratification is fearful to the entire world, whereas a devotee who performs even a slight amount of devotional service is a friend to everyone (suhṛdaṁ sarva-bhūtānām (B.G.5:29). Since the Lord is the well-wisher of every living entity and since a devotee assumes the qualities of the Lord, a devotee also acts for everyone's good fortune by performing devotional service. Thus although Hiraṇyakaśipu performed such a severe austerity, he remained a Daitya and a Rākṣasa, whereas Prahlāda Mahārāja, although born of the same Daitya father, became the most exalted devotee and was personally protected by the Supreme Lord. Bhakti is therefore called sarvopādhi-vinirmuktam (CC.2:19:170), indicating that a devotee is freed from all material designations, and anyābhilāṣitā-śūnyam (Bhakti-rasāmṛta-sindhu 1.1.11), situated in a transcendental position, free from all material desires.

(Srimad Bhagavatam-----7:3:15-16-----purport).

"Persons who have acted piously in previous lives and in this life, whose sinful actions are completely eradicated and who are freed from the duality of delusion, engage themselves in My service with determination." One must be freed from all the sinful dirt of material existence. Everyone in this material world is contaminated by material desire. Unless one is free from all material desire (anyābhilāṣitā-śūnyam (Bhakti-rasāmṛta-sindhu 1.1.11)), one cannot be attracted by Kṛṣṇa.

(Srimad Bhagavatam-----7:5:14-----purport).

Nirmatsarāṇām, persons who are completely transcendental to the material activities of separateness, who make no distinction between "mine" and "yours," but who simply engage in the devotional service of the Lord, are actually fit to accept bhāgavata-dharma (dharmān bhagavatān iha). Because they are nirmatsara, not jealous of anyone, they want to make others devotees, even their enemies. In this regard, Śrīla Madhvācārya remarks, kāṅkṣate mokṣa-gam api sukhaṁ nākāṅkṣato yathā. Devotees are not desirous of any material happiness, including the happiness derived from liberation. This is called anyābhilāṣitā-śūnyaṁ jñāna-karmādy-anāvṛtam (Bhakti-rasāmṛta-sindhu 1.1.11). Karmīs desire material happiness, and jñānīs desire liberation, but a devotee does not desire anything; he is simply satisfied by rendering transcendental loving service at the lotus feet of the Lord and glorifying Him everywhere by preaching, which is his life and soul.

(Srimad Bhagavatam-----7:6:25-----purport).

"No one can understand Kṛṣṇa as He is by the blunt material senses. But He reveals Himself to the devotees, being pleased with them for their transcendental loving service unto Him." (Bhakti-rasāmṛta-sindhu 1.2.234)
bhaktyā mām abhijānāti
yāvān yaś cāsmi tattvataḥ
tato māṁ tattvato jñātvā
viśate tad-anantaram
"One can understand the Supreme Personality as He is only by devotional service. And when one is in full consciousness of the Supreme Lord by such devotion, he can enter into the kingdom of God." (B.G.18:55)

These are Vedic instructions. One must have full faith in the words of the spiritual master and similar faith in the Supreme Personality of Godhead. Then the real knowledge of ātmā and Paramātmā and the distinction between matter and spirit will be automatically revealed. This ātma-tattva, or spiritual knowledge, will be revealed within the core of a devotee's heart because of his having taken shelter of the lotus feet of a mahājana such as Prahlāda Mahārāja.

(Srimad Bhagavatam-----7:7:17-----purport).

To practice bhakti-yoga, one must first accept a bona fide spiritual master. Śrīla Rūpa Gosvāmī, in his Bhakti-rasāmṛta-sindhu (1.2.74-75), advises:
guru-pādāśrayas tasmāt
kṛṣṇa-dīkṣādi-śikṣaṇam
viśrambheṇa guroḥ sevā
sādhu-vartmānuvartanam
sad-dharma-pṛcchā bhogādi-
tyāgaḥ kṛṣṇasya hetave
One's first duty is to accept a bona fide spiritual master. The student or disciple should be very inquisitive; he should be eager to know the complete truth about eternal religion (sanātana-dharma). The words guru-śuśrūṣayā mean that one should personally serve the spiritual master by giving him bodily comforts, helping him in bathing, dressing, sleeping, eating and so on. This is called guru-śuśrūṣaṇam. A disciple should serve the spiritual master as a menial servant, and whatever he has in his possession should be dedicated to the spiritual master.

(Srimad Bhagavatam-----7:7:30-31-----purport).