We accept yad vadasi keśava, following the footsteps of Arjuna, who directly understood Bhagavad-gītā. He said: "My dear Kṛṣṇa, whatever You say, I accept them as it is." Then others may say, "Well, Arjuna was Kṛṣṇa's friend. So just to flatter Him, he might have said like that." No. Arjuna gave immediately evidences that, "I . . . not only I accept You, but great personalities like Vyāsa, Nārada, Devala, Asita and many others." Authorities. Just like when you speak something in the legal court, you give evidences from other judgment, authorities. That is a good case.
Similarly, Arjuna accepted Kṛṣṇa as the Supreme Personality of Godhead. Paraṁ brahma paraṁ dhāma pavitraṁ paramaṁ bhavān (BG 10.12): "My dear Kṛṣṇa, I accept You. You are the Supreme Brahman." Brahmeti paramātmeti bhagavān iti śabdyate. Brahmeti bhagavān, paramātmeti bhagavān iti śabdyate. Therefore Bhagavān is paraṁ brahma. Simply impersonal Brahman realization is not finishing the business. You have to go further, further, further. In the Īśopaniṣad it is said: "My dear Lord, kindly wind up Your blazing effulgence so that I can see You actually." That is stated in the Īśopaniṣad.
So one should not be, I mean to say, amazed simply by realization of impersonal Brahman. There is further business. Brahmeti paramātmeti. Just like we are experiencing daily the sunshine. So if we become satisfied with the sunshine only—"Now we have come to the light"—that is not perfection. You go to the sun planet.