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Śrīmad-Bhāgavatam
[Canto 2, Ch. 8]
praviṣṭaḥ karṇa-randhreṇa svānāṁ bhāva-saroruham dhunoti śamalaṁ kṛṣṇaḥ salilasya yathā śarat
praviṣṭaḥ —thus being entered;  karṇa-randhreṇa —through the holes of the ears;  svānāṁ —according to one's liberated position;  bhāva —constitutional relationship;  saraḥ-ruham —the lotus flower;  dhunoti —cleanses;  śamalaṁ —material qualities like lust, anger, avarice, hankering, etc.;  kṛṣṇaḥ —Lord Kṛṣṇa, the Supreme Personality of Godhead;  salilasya —of the reservoir of waters;  yathā —as it were;  śarat —the autumn season.
TRANSLATION
The sound incarnation of Lord Kṛṣṇa, the Supreme Soul [i.e. Śrīmad-Bhāgavatam], entering into the heart of a self-realized devotee, sits on the lotus flower of his loving relationship and thus cleanses the dust of material association, such as lust, anger, hankerings, etc., and acts like the autumnal rains upon the pools of muddy water.
PURPORT
It is said that a single pure devotee of the Lord can deliver all the fallen souls of the world, and thus one who is actually in the confidence of a pure devotee like Nārada or Śukadeva Gosvāmī and thus empowered by one's spiritual master, as Nārada was by Brahmājī, can not only deliver himself from the clutches of  māyā , or illusion, but can deliver the whole world by his pure and empowered devotional strength. The comparison to the autumnal rain which falls on the muddy reservoirs of water is very appropriate. During the rainy season, all waters of the rivers become muddy, but in the month of July-August, the autumn season, when there is a slight rainfall, the muddy waters of the rivers all over the world become at once clear. By addition of some chemical, a small reservoir of water like that of the metropolitan waterworks tanks, etc., can be cleared, but by such a tiny effort it is not possible to clear up all the reservoirs of water like the rivers, etc. Similarly, a powerful pure devotee of the Lord can deliver not only his personal self but also many others in his association.
In other words, the cleansing of the polluted heart by other methods (like culture of empiric knowledge or mystic gymnastics) can simply