(Click to enlarge photo of Srila Prabhupada)
"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. As the mind is completely cleansed, one attains the perfectional stage of mystic yoga, for then the yogī always sees the Supreme Personality of Godhead within his heart (dhyanāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ [SB 12.13.1]). As soon as the Lord is seated within the heart of the devotee, the devotee cannot be contaminated by the material modes of nature. As long as one is under the control of the material modes, he desires so many things and makes so many plans for material sense enjoyment, but as soon as the Lord is perceived in the heart, all material desires vanish. When the mind is completely free from material desire, the devotee can think of the Lord constantly. In this way he becomes completely dependent upon the lotus feet of the Lord. Caitanya Mahāprabhu prays:
ayi nanda-tanuja kiṅkaraṁ
patitaṁ māṁ viṣame bhavāmbudhau
kṛpayā tava pāda-paṅkaja-
'My dear Lord, I am Your eternal servant, but somehow or other I have fallen into the ocean of this material world. Kindly pick me up and fix me as a speck of dust at Your lotus feet.' (Śikṣāṣṭaka 5) Similarly, Śrīla Narottama dāsa Ṭhākura prays:
hā hā prabhu nanda-suta, vṛṣabhānu-sutā-yuta,
karuṇā karaha ei-bāra
narottama-dāsa kaya, nā ṭheliha rāṅgā-pāya,
tomā vine ke āche āmāra
'My dear Lord, You are now present with the daughter of King Vṛṣabhānu, Śrīmatī Rādhārāṇī. Now both of You please be merciful upon me. Don't kick me away, because I have no shelter other than You.'
In this way the Supreme Personality of Godhead becomes dependent on His devotee. The Lord is invincible, yet He is conquered by His pure devotee. He enjoys being dependent on His devotee, just as Kṛṣṇa enjoyed being dependent on the mercy of mother Yaśodā. Thinking Himself dependent on the devotee gives the Supreme Lord great enjoyment. Sometimes a king may engage a joker, and in the process of joking, the king is sometimes insulted. The king, however, enjoys these activities. Everyone worships the Supreme Lord with great reverence; therefore the Lord sometimes wants to enjoy the chastisement of His devotees. In this way the relationship eternally existing between the Lord and His devotees is fixed, just like the sky overhead."
(Śrīmad-Bhāgavatam 4.31.20, Purport)