Kṛṣṇa clearly says that only those who have lost their sense worship the demigods for paltry rewards (7.20, 23). Ultimately He advises that one give up all other ways and modes of worship and fully surrender unto Him alone (18.66). Only those who are cleansed of all sinful reactions can have such unflinching faith in the Supreme Lord. Others will continue hovering on the material platform with their paltry ways of worship and thus will be misled from the real path under the false impression that all paths lead to the same goal.
In this mantra of Śrī Īśopaniṣad the word sam-bhavāt, "by worship of the supreme cause," is very significant. Lord Kṛṣṇa is the original Personality of Godhead, and everything that exists has emanated from Him. In the Bhagavad-gītā (10.8) the Lord says,
- ahaṁ sarvasya prabhavo
- mattaḥ sarvaṁ pravartate
- iti matvā bhajante māṁ
- budhā bhāva-samanvitāḥ
"I am the source of all spiritual and material worlds. Everything emanates from Me. The wise who perfectly know this engage in My devotional service and worship Me with all their hearts."
Here is a correct description of the Supreme Lord, given by the Lord Himself. 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. 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."
Thus all Vedic literature confirms that Nārāyaṇa, or Kṛṣṇa, is the cause of all causes. In the Brahma-saṁhitā (5.1) also it is said that the Supreme Lord is Śrī Kṛṣṇa, Govinda, the delighter of every living being and the primeval cause of all causes. The really learned persons know this from evidence given by the great sages and the Vedas, and thus they decide to worship Lord Kṛṣṇa as all in all. Such persons are called budha, or really learned, because they worship only Kṛṣṇa.