Srimad Bhagavatam Canto 05, Chapter 25, Text 08

SB 5.25.8

ya esa evam anusruto dhyayamano mumuksunam anadi-kala-karma-vasana-grathitam avidyamayam hrdaya-granthim sattva-rajas-tamomayam antar-hrdayam gata asu nirbhinatti tasyanubhavan bhagavan svayambhuvo naradah saha tumburuna sabhayam brahmanah samslokayam asa.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
If persons who are very serious about being liberated from material life hear the glories of Anantadeva from the mouth of a spiritual master in the chain of disciplic succession, and if they always meditate upon Sankarsana, the Lord enters the cores of their hearts, vanquishes all the dirty contamination of the material modes of nature, and cuts to pieces the hard knot within the heart, which has been tied tightly since time immemorial by the desire to dominate material nature through fruitive activities. Narada Muni, the son of Lord Brahma, always glorifies Anantadeva in his father’s assembly. There he sings blissful verses of his own composition, accompanied by his stringed instrument [or a celestial singer] known as Tumburu.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
None of these descriptions of Lord Anantadeva are imaginary. They are all transcendentally blissful and full of actual knowledge. However, unless one hears them directly from a bona fide spiritual master in the line of disciplic succession, one cannot understand them. This knowledge is delivered to Narada by Lord Brahma, and the great saint Narada, along with his companion, Tumburu, distributes it all over the universe. Sometimes the Supreme Personality of Godhead is described as Uttamasloka, one who is praised by beautiful poetry. Narada composes various poems to glorify Lord Ananta, and therefore the word samslokayam asa (praised by selected poetry) is used in this verse.
The Vaisnavas in the Gaudiya-sampradaya belong to the disciplic succession stemming from Lord Brahma. Lord Brahma is the spiritual master of Narada, Narada is the spiritual master of Vyasadeva, and Vyasadeva wrote the Srimad-Bhagavatam as a commentary on the Vedanta-sutra. Therefore all devotees in the Gaudiyasampradaya accept the activities of Lord Ananta related in the Srimad-Bhagavatam as authentic, and they are thus benefited by going back home, back to Godhead. The contamination in the heart of a conditioned soul is like a huge accumulation of garbage created by the three modes of material nature, especially the modes of rajas (passion) and tamas (ignorance). This contamination becomes manifest in the form of lusty desires and greed for material possessions. As confirmed herein, unless one receives transcendental knowledge in disciplic succession, there is no question of his becoming purified of this contamination.
Srimad Bhagavatam Canto 05, Chapter 25, Text 07
Srimad Bhagavatam Canto 05, Chapter 25, Text 09