(Click to enlarge photo of Srila Prabhupada)
"Man can go on speculating for several millions of years, and if he is not devoted, if he is not a lover of the Supreme Truth, he will never understand Kṛṣṇa or the Supreme Truth. 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; therefore he is just like the sun that dissipates the darkness of ignorance. This is the special mercy rendered to the pure devotee by Kṛṣṇa.
Due to the contamination of material association, through many, many millions of births, one's heart is always covered with the dust of materialism, but when one engages in devotional service and constantly chants Hare Kṛṣṇa, the dust quickly clears, and one is elevated to the platform of pure knowledge. The ultimate goal of Viṣṇu can be attained only by this chant and by devotional service, and not by mental speculation or argument. The pure devotee does not have to worry about the necessities of life; he need not be anxious because when he removes the darkness from his heart, everything is provided automatically by the Supreme Lord, for He is pleased by the loving devotional service of the devotee. This is the essence of the Gītā's teachings. By studying Bhagavad-gītā, one can become a completely surrendered soul to the Supreme Lord and engage himself in pure devotional service. As the Lord takes charge, one becomes completely free from all kinds of materialistic endeavors."
(Bhagavad-gītā As It Is 10.11, Purport)
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