"The Personality of Godhead can be experienced only by His causeless mercy, not by mental speculation or with the help of the material senses. Material senses cannot approach the transcendental understanding of the Supreme Personality of Godhead. He can be appreciated only by submissive devotional service when He reveals Himself before the devotee. Only by love of Godhead can one know God, and not otherwise. The Personality of Godhead cannot be seen with material eyes, but He can be seen from within by spiritual eyes opened by the ointment of love of Godhead."
(Srimad-Bhagavatam, 3.9.37, Purport)
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