Only by devotional service is the Supreme Truth, Kṛṣṇa, pleased, and by His inconceivable energy He can reveal Himself to the heart of the pure devotee. The pure devotee always has Kṛṣṇa within his heart; and with the presence of Kṛṣṇa, who is just like the sun, the darkness of ignorance is at once dissipated. This is the special mercy rendered to the pure devotee by Kṛṣṇa.
(Bhagavad-Gita------10:11------purport).

And how the Lord feels about sādhus is revealed by the Lord Himself in the Śrīmad-Bhāgavatam (9.4.68):
sādhavo hṛdayaṁ mahyaṁ
sādhūnāṁ hṛdayaṁ tv aham
mad-anyat te na jānanti
nāhaṁ tebhyo manāg api
The pure devotee is always within the core of My heart, and I am always in the heart of the pure devotee. My devotees do not know anything else but Me, and I do not know anyone else but them.

The Lord always resides in the heart of His pure devotees, and so they have the potency to purify the places of pilgrimage, which become heavily laden with the sins deposited there by all the pilgrims. These are some of the glories of the Lord's pure, surrendered devotees.
(Renunciation through Wisdom).

The pure devotee is always within the core of My heart, and I am always in the heart of the pure devotee. My devotees do not know anything else but Me, and I do not know anyone else but them.
(Srimad Bhagavatam-----9:4:68-------translation).

It is confirmed in the Bhagavad-gītā by the Lord Himself that He gives His instruction from within the heart of a pure devotee who is constantly engaged in the service of the Lord. Such instruction is given not for any material purpose but only for going back home, back to Godhead (Bg. 10.10).
(Srimad Bhagavatam-----1:9:32-----purport).

The Supreme Personality of Godhead, Kṛṣṇa, is always situated within the core of the heart of the pure devotee, and He is always offered prayers by such worshipable personalities as Lord Brahmā and Lord Śiva. Because Kṛṣṇa embraced Pūtanā's body with great pleasure and sucked her breast, although she was a great witch, she attained the position of a mother in the transcendental world and thus achieved the highest perfection. What then is to be said of the cows whose nipples Kṛṣṇa sucked with great pleasure and who offered their milk very jubilantly with affection exactly like that of a mother?
(Srimad Bhagavatam-----10:6:37-------translation).

It is clear from the previous verse that the Supreme Personality of Godhead, Janārdana, is very quickly satisfied by the activities of His devotees. The pure devotee is always absorbed in the thought of the Supreme Personality of Godhead. As stated, śṛṇvatāṁ sva-kathāḥ kṛṣṇaḥ [SB 1.2.17]. By always thinking of Kṛṣṇa, the pure devotee's heart is freed from all kinds of desires. In the material world, the heart of the living entity is filled with material desires. When the living entity is cleansed, he does not think of anything material.
(Srimad Bhagavatam-----4:31:20-----purport).-----purport).

How can the fire of material suffering continue to burn the hearts of those who worship the Supreme Lord? The Lord's lotus feet have performed innumerable heroic deeds, and the beautiful nails on His toes resemble valuable jewels. The effulgence emanating from those nails resembles cooling moonshine, for it instantly relieves the suffering within the heart of the pure devotee, just as the appearance of the moon's cooling light relieves the burning heat of the sun.
(Srimad Bhagavatam-----11:2:54-------translation).