Śrī Caitanya-caritāmṛta - Ādi-līlā 1.53

"“Prior to the cosmic creation, only I exist, and no phenomena exist, either gross, subtle or primordial. After creation, only I exist in everything, and after annihilation, only I remain eternally."

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Śrī Caitanya Caritāmṛta, Ādi-līlā 1.53