I worship Govinda, the primeval Lord, who is Śyāmasundara, Kṛṣṇa Himself with inconceivable innumerable attributes, whom the pure devotees see in their heart of hearts with the eye of devotion tinged with the salve of love. (Bs 5.38)
…The phrase “in their hearts” means Kṛṣṇa is visible in proportion as their hearts are purified by the practice of devotion. The sum and substance of this śloka is that the form of Kṛṣṇa, who is Śyāmasundara, Naṭavara (Best Dancer), Muralīdhara (Holder of the Flute) and Tribhaṅga (Triple-bending), is not a mental concoction but is transcendental, and is visible with the eye of the soul of the devotee under trance. (from purport)
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The Hare Krishna Movement 