The self-interest is to understand Viṣṇu. Tad viṣṇoḥ paramaṁ padam. That is our aim. Viṣṇu and Kṛṣṇa, the same. But there is controversy whether Viṣṇu is secondary or Kṛṣṇa is secondary. According to śāstra, nobody's secondary. Viṣṇu and Kṛṣṇa, They are simply expansion. They are not different. Advaitam acyutam anādim ananta-rūpam (Bs. 5.33). Viṣṇu has ananta-rūpam, unlimited forms. Advaitam acyutam. They are not different. The other day I explained. The candle... First candle, second candle, third candle... But no candle is less powerful than the other candles. This is the conclusion. So either we say Viṣṇu or we say Kṛṣṇa or Rāma, Nṛsiṁha, Balarāma, They are all expansions of the Supreme Person Kṛṣṇa. Therefore Kṛṣṇa says, mattaḥ parataraṁ nānyat: (BG 7.7) "There is no more superior authority than Me." This is the conclusion. Mattaḥ, "from Me," na anyat, "nobody else is superior." That is the conclusion of the śāstra. And Kṛṣṇa personally also says. Mattaḥ parataraṁ nānyat kiñcit. "Nobody."
There is controversy... In another place Kṛṣṇa says, aham ādir hi devānām (Bg 10.2). He is the origin of all demigods. The principal demigods are Viṣṇu and Maheśvara and... Maheśvara means Lord Śiva. And Brahmā. Brahmā, Viṣṇu, Maheśvara. So Kṛṣṇa is the origin of Brahmā, Viṣṇu, Maheśvara. They are guṇa-avatāra. For maintaining this material world... The material world is composed of three guṇas: sattva, rajas, tamas. So the director of the sattva-guṇa department is Lord Viṣṇu, and the director of the rajo-guṇa department is Lord Brahmā, and the director of the tamo-guṇa department is Lord Śiva. Origin is Kṛṣṇa. Therefore in the Śrīmad-Bhāgavatam it is concluded after describing all the incarnations of God, different incarnations, the conclusion is made, ete cāṁśa-kalāḥ puṁsaḥ kṛṣṇas tu bhagavān svayam: (SB 1.3.28) "All the incarnations mentioned in this chapter, they are either expansion of the Supreme Personality of Godhead or expansion of the expansion, secondary expansion." Aṁśa-kalā. Aṁśa means expansion, and kalā means expansion of the expansion. Just like a... First expansion is Balarāma, and from Balarāma, next expansion is the catur-vyūha, Saṅkarṣaṇa, Pradyumna, Vāsudeva, Pradyumna, Aniruddha, Saṅkarṣaṇa. These expansions are going on. But that expansion does not mean one expansion is less powerful than the other. This is transcendental, the same formula. Advaitam acyutam anādim. Advaita, always advaita. Not different. Acyuta, not fall down. So Kṛṣṇa is the origin. Īśvaraḥ paramaḥ kṛṣṇaḥ (Bs. 5.1). They are īśvara. Īśvara means controller, powerful. Even the demigods, they are also īśvaras. You are also īśvara. I am also īśvara. Īśvara means controller. Anyone who has got little control, he can be called īśvara. That is the dictionary meaning. But even the original īśvaras, namely Brahmā, Viṣṇu, Maheśvara, they are also not supreme īśvara. The supreme īśvara is Kṛṣṇa. Īśvaraḥ paramaḥ kṛṣṇaḥ (Bs. 5.1). That is the shastric inclusion, conclusion.
So śāstra says Kṛṣṇa is the Supreme Personality of Godhead, and Kṛṣṇa Himself also says, mattaḥ parataraṁ nānyat (BG 7.7). Therefore, as Arjuna understood Kṛṣṇa, paraṁ brahma paraṁ dhāma pavitraṁ paramaṁ bhavān... (BG 10.12). Arjuna has said that "I heard from the śāstras about Yourself, and You are personally speaking that You are the Supreme. And not only that, the great sages like Vyāsadeva, Asita, Devala, great authorities, they also admit that You are the Supreme Personality of Godhead." Therefore there is no doubt. The conclusion is the Supreme Personality of Godhead is Kṛṣṇa. As it was in the beginning said by Kṛṣṇa, asaṁśayaṁ samagraṁ māṁ yathā jñāsyasi tac chṛṇu (BG 7.1). Asaṁśayam, "without any doubt."