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."
Śrī Caitanya Caritāmṛta, Ādi-līlā 1.53