In Caitanya-caritāmṛta it is said: yad advaitaṁ brahmopaniṣadi tad apy asya tanu-bhā. The impersonal Brahman effulgence of the Absolute Truth consists of the bodily rays of the Supreme Personality of Godhead. Ya ātmāntaryāmī puruṣa iti so 'syāṁśa-vibhavaḥ. What is known as ātmā and antaryāmī, the Supersoul, is but an expansion of the Supreme Personality of Godhead. Sad-aiśvaryaiḥ pūrṇo ya iha bhagavān sa svayam ayam (CC.1:1:3). What is described as the Supreme Personality of Godhead, complete with all six opulences, is Vāsudeva, and Śrī Caitanya Mahāprabhu is nondifferent from Him. Great learned scholars and philosophers accept this after many, many births. Vāsudevaḥ sarvam iti sa mahātmā sudurlabhaḥ (B.G.7:19). The wise man can understand that ultimately Vāsudeva, Kṛṣṇa, is the cause of Brahman, and Paramātmā, the Supersoul. Thus Vāsudeva is sarva-kāraṇa-kāraṇam (Bs. 5.1), the cause of all causes. This is confirmed in Śrīmad-Bhāgavatam. The real tattva, Absolute Truth, is Bhagavān, but due to incomplete realization of the Absolute Truth, people sometimes describe the same Viṣṇu as impersonal Brahman or localized Paramātmā.
(Srimad Bhagavatam-------5:12:11------purport).