If you simply understand these two words, that Kṛṣṇa is the Supreme Personality of Godhead, then you are advanced. It is not very difficult. Everything, all Vedic literature, they are meant for understanding Kṛṣṇa. Vedaiś ca sarvair aham eva vedyam (BG 15.15). So if you simply understand... What is that understanding? That Kṛṣṇa is the Supreme Personality of Godhead. We have written in our Kṛṣṇa book, "Kṛṣṇa, the Supreme Personality of Godhead." If you become convinced, then your study of Vedas—finished. Tepus tapas te sasnur āryā (SB 3.33.7). Anyone who understands Kṛṣṇa... What is that understanding? Kṛṣṇa says, mattaḥ parataraṁ nānyat kiñcid asti dhanañjaya: (BG 7.7) "My dear Arjuna, there is no more superior authority or person or truth than Myself." Mattaḥ parataraṁ nānyat kiñcid asti dhanañjaya (BG 7.7). These few words, if you simply understand... Blindly or openly, it doesn't matter. Because if you touch fire, either blindly or openly, it will act. It will act. It is not that because I blindly accept Kṛṣṇa as the Supreme Person, that will not act. No, it will act. Even if you have accepted Kṛṣṇa blindly, it will act. Because the thing is the same. Either you accept in open eyes or blind eyes. So similarly, if you accept this theory—it is not theory; this is fact, that Kṛṣṇa is the Supreme Personality of Godhead—these few words, then you are advanced student, immediately. Take it from me, that simply this conviction, that "Kṛṣṇa is the Supreme Personality of Godhead," then you are advanced student in spiritual life.
So all these persons associated with Kṛṣṇa, Śrī Kṛṣṇa Caitanya, Śrī Nityānanda, Śrī Advaita, and Gadādhara and Śrīvāsa, all of them, they are one. One in this sense, they are all interested how to push on Kṛṣṇa consciousness. Śrī Kṛṣṇa Caitanya Mahāprabhu, He's trying personally, the Supreme Personality of Godhead. And Nityānanda Prabhu, Advaita Prabhu, Śrīvāsa, Gadādhara, they are trying to help. So..., and to approach all these five supreme persons, you require the help of guru. Therefore the guru is offered first the respectful prayers, vande gurūn. And gurūn, bahu-vacana, plural number, that many gurus. But they are not many; they are one, guru-tattva. Just like Kṛṣṇa has many forms, but that does not mean Kṛṣṇa is different. No. Kṛṣṇa is one. Similarly, guru, there may be many gurus, it doesn't matter, but their philosophy must be one: to teach everyone that Kṛṣṇa is the Supreme Personality of Godhead. So there may be thousands of gurus, but the guru's business is to teach the disciple that Kṛṣṇa is the Supreme Personality of Godhead. That is the test of guru. If guru is teaching something else, nonsense, then he is not guru. Gurur na sa syāt. Ṣaṭ-karma-nipuṇo vipro mantra-tantra-viśāradaḥ. A brāhmaṇa, he is very expert in his business, in Vedic culture, Vedic mantras, tantras. That is the test of the brāhmaṇa, that he is very learned. So ṣaṭ-karma-nipuṇo vipro mantra-tantra-viśāradaḥ. Viśārada, very expert. Avaiṣṇavo gurur na sa syāt. But if he does not know what is Kṛṣṇa or if he's not a devotee of Kṛṣṇa, he cannot become guru. Ṣaḍ-vaiṣṇavaḥ śvapaco guruḥ. But one person who is coming from the family of dog-eaters... The dog-eaters, they are considered to be the lowest of the human beings. So, śva-paca, śva means dog, and paca means eater or cooker. So śvapaca, even a person is coming from the śvapaca family, and if he's a Vaiṣṇava, if he's a devotee of Kṛṣṇa, he can become guru. On the other side, even born in a brāhmaṇa family and very expert in Vedic ritualistic performances, mantra-tantra-viśāradaḥ, he cannot become guru if he does not understand Kṛṣṇa. So therefore guru is very important because he has accepted Kṛṣṇa... Tattva-darśibhiḥ, he has seen the truth. So therefore guru is first offered... This is the test of guru. Guru does not become Kṛṣṇa himself, but he canvasses door to door to induce that "You become devotee of Kṛṣṇa." This is sign of guru. Vande gurūn īśa-bhaktān. Īśa-bhaktān. Then we shall describe later on.