There is no possibility of understanding the Supreme Truth, the Absolute Truth, the Supreme Personality of Godhead, simply by speculating, for the Supreme Truth is so great that it is not possible to understand Him or to achieve Him simply by making a mental effort. Man can go on speculating for several millions of years, but if he is not devoted, if he is not a lover of the Supreme Truth, he will never understand Krsna, or the Supreme Truth.
Only by devotional service is the Supreme Truth, Krsna, pleased, and by His inconceivable energy He can reveal Himself to the heart of the pure devotee.
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 Krsna, the dust quickly clears, and one is elevated to the platform of pure knowledge.
Those who are engaged in pure devotional service, even though they be without sufficient education and even without sufficient knowledge of the Vedic principles, are still helped by the Supreme Lord, Krsna who is pleased by the sincere devotional service rendered by the devotee.