Śrī Caitanya-caritāmṛta - Madhya-līlā 20.149-150

"“The transcendental form of Lord Kṛṣṇa is unlimited and also has unlimited opulence. He possesses the internal potency, external potency and marginal potency."

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"“The material and the spiritual world are transformations of Kṛṣṇa’s external and internal potencies respectively. Therefore Kṛṣṇa is the original source of both the material and the spiritual manifestations."

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Śrī caitanya-caritāmṛta Madhya 20.149 & 150