These imperfect senses cannot realize Kṛṣṇa as He is. Then the process is sevonmukhe hi jihvādau. If you become submissive, if you develop the spirit of service to Kṛṣṇa, either as servant or as friend or as parent or as lover, if you begin to give service to the Supreme Lord... The beginning of service is chanting. Therefore it is said, jihvādau. Jihvādau means, jihva means tongue. Tongue. Your service begins by the tongue. How? By the tongue you can chant Hare Kṛṣṇa, and by the tongue you can taste Kṛṣṇa's prasādam. So the beginning process is very nice. You chant Kṛṣṇa, Hare Kṛṣṇa, Hare Kṛṣṇa, and whatever little prasādam is offered to you by Kṛṣṇa by His kindness, you accept it. Then the result will be that sevonmukhe hi jihvādau. If you become submissive and if you begin this service, chanting and eating prasādam, then svayam eva sphuraty adaḥ, simply by these two kinds of practices, Kṛṣṇa will Himself reveal Himself before you, "I am like this." You cannot understand Kṛṣṇa by speculation. No, that is not possible, because your senses are imperfect. But if you begin this process of service, then it will be possible that one day Kṛṣṇa will reveal to you, "I am like this."
Just like Kṛṣṇa is revealing in the Bhagavad-gītā to Arjuna. Arjuna is a devotee, and he is submissive. And he is friend also. He is in contact with Kṛṣṇa as friend. Therefore Kṛṣṇa is revealing to Kṛṣṇa..., ah, to Arjuna. This Bhagavad-gītā is spoken to Arjuna, not to any Vedantist or speculationist. In the beginning of the Fourth Chapter, you know that Kṛṣṇa says that "I'll speak to you that old system of yoga, bhakti-yoga," in the beginning of the Fourth Chapter, "unto you." Why? Kṛṣṇa was not a Vedantist... Ah, Arjuna was not a Vedantist or a great philosopher or a brāhmaṇa or nothing. He was a kṣatriya. He was a fighter, and a householder, not even a sannyāsī. So these are not qualifications to understand Kṛṣṇa. Suppose... Just like I have become a sannyāsī, mendicant. This is not qualification that I can understand Kṛṣṇa. Even in your white dress, as gṛhastha, you can understand better than me. Then what is the qualification? This qualification: sevonmukhe hi jihvādau (Brs. 1.2.234). One who has developed the service spirit with love and devotion, he can understand Kṛṣṇa. Nobody else. Nobody... Not Dr. Radhakrishnan or similar person. No. But a child can understand Kṛṣṇa if he has full faith in Him.
So it is the faith and devotion that makes one qualified to understand God. Mad-āśrayaḥ. This is called mad-āśrayaḥ. Now by simply that faith and service, you'll understand that Kṛṣṇa is the Supreme Personality of Godhead. Now just like we are preaching Kṛṣṇa consciousness. We are not wasting your time or our time without having full faith that Kṛṣṇa is the Supreme Personality of Godhead, theoretically or practically. Theoretically, if you take that "How Kṛṣṇa is the Supreme Personality of Godhead?" theoretically, from the revealed scriptures, we understand from the Vedic literature that great authorities in the past and in the present...
Take for the present Lord Caitanya. Lord Caitanya is a great authority, a recognized, great authority. Oh, He is mad after Kṛṣṇa. He is mad after Kṛṣṇa. Then after Him, His six disciples, Gosvāmīs, the Rūpa Gosvāmī, Sanātana Gosvāmī, they have written immense literature, valuable literatures—especially Jīva Gosvāmī—volumes of literature on Kṛṣṇa. So... Then, under disciplic succession also, we have come to this point, and if you take past history, bygone, long, long ago, Vyāsadeva, who is known as Vedavyāsa, he has written book, Śrīmad-Bhāgavatam, on Kṛṣṇa. Śrīmad-Bhāgavatam is nothing but description of Kṛṣṇa. Vyāsadeva is also writer of Bhagavad-gītā. The Bhagavad-gītā was spoken by Kṛṣṇa and noted down by Vyāsadeva. And he has put this Bhagavad-gītā in the Mahābhārata. So Vyāsadeva accepts Kṛṣṇa as the Supreme Personality. He has, in the Bhāgavatam, he has specifically mentioned, kṛṣṇas tu bhagavān svayam. He has given description of different other incarnations of God. There are about twenty-five incarnations. In the conclusion he said that ete cāṁśa-kalāḥ puṁsaḥ kṛṣṇas tu bhagavān svayam (SB 1.3.28), that "All the descriptions that are given of different incarnations, they are partially or part of the partial representation of God, but this Kṛṣṇa whom I have mentioned, He is the Supreme Personality of Godhead Himself." He is not part. Cent percent. Cent percent God.