CC Madhya 20.150
svarūpa-śakti śakti-kāryera — kṛṣṇa samāśraya
vaikuṇṭha — the spiritual world; brahmāṇḍa-gaṇa — universes of the material world; śakti-kārya haya — they are all activities of Kṛṣṇa’s potencies; svarūpa-śakti — of the internal potency; śakti-kāryera — of the activities of the external potency; kṛṣṇa — Lord Kṛṣṇa; samāśraya — the original source.
“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.