Śrī Caitanya-caritāmṛta - Ādi-līlā 1.58

"Since one cannot visually experience the presence of the Supersoul, He appears before us as a liberated devotee. Such a spiritual master is none other than Kṛṣṇa Himself."

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Śrī Caitanya Caritāmṛta, Ādi-līlā 1.58