A learned scholar who has studied the Vedas perfectly and has information from authorities like Lord Caitanya and who knows how to apply these teachings can understand that Kṛṣṇa is the origin of everything in both the material and spiritual worlds, and because he knows this perfectly he becomes firmly fixed in the devotional service of the Supreme Lord. He can never be deviated by any amount of nonsensical commentaries or by fools. All Vedic literature agrees that Kṛṣṇa is the source of Brahmā, Śiva and all other demigods. In the Atharva Veda (Gopāla-tāpanī Upaniṣad 1.24) it is said, yo brahmāṇaṁ vidadhāti pūrvaṁ yo vai vedāṁś ca gāpayati sma kṛṣṇaḥ: "It was Kṛṣṇa who in the beginning instructed Brahmā in Vedic knowledge and who disseminated Vedic knowledge in the past." Then again the Nārāyaṇa Upaniṣad (1) says, atha puruṣo ha vai nārāyaṇo 'kāmayata prajāḥ sṛjeyeti: "Then the Supreme Personality Nārāyaṇa desired to create living entities." The Upaniṣad continues, nārāyaṇād brahmā jāyate, nārāyaṇād prajāpatiḥ prajāyate, nārāyaṇād indro jāyate, nārāyaṇād aṣṭau vasavo jāyante, nārāyaṇād ekādaśa rudrā jāyante, nārāyaṇād dvādaśādityāḥ: "From Nārāyaṇa, Brahmā is born, and from Nārāyaṇa the patriarchs are also born. From Nārāyaṇa, Indra is born, from Nārāyaṇa the eight Vasus are born, from Nārāyaṇa the eleven Rudras are born, from Nārāyaṇa the twelve Ādityas are born." This Nārāyaṇa is an expansion of Kṛṣṇa.
(Bhagavad-Gita-----10:8-----purport).

It is said in the same Vedas, brahmaṇyo devakī-putraḥ: "The son of Devakī, Kṛṣṇa, is the Supreme Personality." (Nārāyaṇa Upaniṣad 4) Then it is said, eko vai nārāyaṇa āsīn na brahmā na īśāno nāpo nāgni-samau neme dyāv-āpṛthivī na nakṣatrāṇi na sūryaḥ: "In the beginning of the creation there was only the Supreme Personality Nārāyaṇa. There was no Brahmā, no Śiva, no water, no fire, no moon, no stars in the sky, no sun." (Mahā Upaniṣad 1) In the Mahā Upaniṣad it is also said that Lord Śiva was born from the forehead of the Supreme Lord. Thus the Vedas say that it is the Supreme Lord, the creator of Brahmā and Śiva, who is to be worshiped.
(Bhagavad-Gita-----10:8-----purport).

(2) From the Nārāyaṇātharva-śira Upaniṣad (1–2): nārāyaṇād eva samutpadyante nārāyaṇāt pravartante nārāyaṇe pralīyante. . . . atha nityo nārāyaṇah. . . . nārāyaṇa evedaṁ sarvaṁ yad bhūtaṁ yac ca bhavyam. . . . śuddho deva eko nārāyaṇo na dvitīyo ’sti kaścit. "It is from Nārāyaṇa only that everything is generated, by Him only that everything is maintained, and in Him only that everything is annihilated. Therefore Nārāyaṇa is eternally existing. Everything that exists now or will be created in the future is nothing but Nārāyaṇa, who is the unadulterated Deity. There is only Nārāyaṇa and nothing else."
(3) From the Nārāyaṇa Upaniṣad (1.4): yataḥ prasūtā jagataḥ prasūtī. "Nārāyaṇa is the source from whom all the universes emanate."
(4) From the Hayaśīrṣa Pañcarātra: paramātmā harir devaḥ. "Hari is the Supreme Lord."
(5) From Śrīmad-Bhāgavatam (S.B.11:3:34):
nārāyaṇābhidhānasya
brahmaṇaḥ paramātmanaḥ
niṣṭhām arhatha no vaktuṁ
yūyaṁ hi brahma-vittamāḥ
"O best of the brāhmaṇas, please tell us of the position of Nārāyaṇa, who is also known as Brahman and Paramātmā."
(Sri Caitanya Caritamrta-----1:2:24-----purport).

The words sarvasya pra-bhavaḥ indicate that Kṛṣṇa is the creator of everyone, including Brahmā, Viṣṇu and Śiva. And because these three principal deities of the material world are created by the Lord, the Lord is the creator of all that exists in the material and spiritual worlds. In the Atharva Veda (Gopāla-tāpanī Upaniṣad 1.24) it is similarly said, "He who existed before the creation of Brahmā and who enlightened Brahmā with Vedic knowledge is Lord Śrī Kṛṣṇa." Similarly, the Nārāyaṇa Upaniṣad (1) states, "Then the Supreme Person, Nārāyaṇa, desired to create all living beings. Thus from Nārāyaṇa, Brahmā was born. Nārāyaṇa created all the Prajāpatis. Nārāyaṇa created Indra. Nārāyaṇa created the eight Vasus. Nārāyaṇa created the eleven Rudras. Nārāyaṇa created the twelve Ādityas." Since Nārāyaṇa is a plenary manifestation of Lord Kṛṣṇa, Nārāyaṇa and Kṛṣṇa are one and the same.
(Sri Isopanishad).

The Nārāyaṇa Upaniṣad (4) also states, "Devakī's son (Kṛṣṇa) is the Supreme Lord." The identity of Nārāyaṇa with the supreme cause has also been accepted and confirmed by Śrīpāda Śaṅkarācārya, even though Śaṅkara does not belong to the Vaiṣṇava, or personalist, cult. The Atharva Veda (Mahā Upaniṣad 1) also states, "Only Nārāyaṇa existed in the beginning, when neither Brahmā, nor Śiva, nor fire, nor water, nor stars, nor sun, nor moon existed. The Lord does not remain alone but creates as He desires." Kṛṣṇa Himself states in the Mokṣa-dharma, "I created the Prajāpatis and the Rudras. They do not have complete knowledge of Me because they are covered by My illusory energy." It is also stated in the Varāha Purāṇa: "Nārāyaṇa is the Supreme Personality of Godhead, and from Him the four-headed Brahmā was manifested, as well as Rudra, who later became omniscient."
(Sri Isopanishad).