When a conditioned soul becomes a devotee of Kṛṣṇa, the Lord, by His causeless mercy, trains him in two ways: He trains him from without as the spiritual master, and He trains him from within as the Supersoul. In this connection there is a very nice verse in Śrīmad-Bhāgavatam (11.29.6), in which Uddhava says to Lord Kṛṣṇa: "My dear Lord, even if someone lives as long as Brahmā, he would still be unable to express his gratitude to You for the benefits derived from remembering You. Out of Your causeless mercy You drive away all inauspicious conditions for Your devotee, expressing Yourself from outside as the spiritual master and from inside as the Supersoul."
If one somehow or other gets in touch with a pure devotee and thus develops a desire to render devotional service to Kṛṣṇa, he gradually rises to the platform of love of Godhead and is thus freed from the clutches of the material energy. This is confirmed in Śrīmad-Bhāgavatam (11.20.8) where the Lord says, "For one who, out of his own accord, becomes attracted to topics of My activities—being neither allured nor repelled by material activities—following the path of devotional service leading to the perfection of love of God becomes possible." However, it is not possible to achieve the stage of perfection without being favored by a pure devotee, or a mahātmā, a great soul. Without the mercy of a great soul, one cannot even be liberated from the material clutches, and what to speak of rising to the platform of love of Godhead. This is also confirmed in Śrīmad-Bhāgavatam (5.12.12), in a conversation between Jada Bharata and King Rahūgaṇa, ruler of the Sindhu and Sauvīra provinces. When King Rahūgaṇa expressed surprise upon seeing Bharata's spiritual achievements, Bharata replied:
- rahūgaṇaitat tapasā na yāti
- na cejyayā nirvapaṇād gṛhād vā
- na cchandasā naiva jalāgni-sūryair
- vinā mahat-pāda-rajo ’bhiṣekam
"My dear Rahūgaṇa, no one can attain the perfected stage of devotional service without being favored by a great soul, a pure devotee. No one can attain the perfectional stage simply by following the regulative principles of scriptures, or by accepting the renounced order of life, or by prosecuting the prescribed duties of householder life, or by becoming a great student of spiritual science, or by accepting severe austerity and penances for realization." Similarly, when the atheist Hiraṇyakaśipu asked his son Prahlāda Mahārāja how he had attained such a devotional attitude, the boy replied, "As long as one is not favored by the dust of the feet of pure devotees, one cannot even touch the path of devotional service, which is the solution to all the problems of material life." (Śrīmad-Bhāgavatam 7.5.32)