So this Kṛṣṇa consciousness movement is to give chance to everyone to hear about Kṛṣṇa. This is the first process, śravaṇam. And when one has heard very nicely about Kṛṣṇa, they can, then he can speak about Kṛṣṇa. And he must speak. You cannot remain without speaking. That is the result of śravaṇam. Śravaṇaṁ kīrtanam. One who has heard nicely, he must speak or preach. And preaching and hearing about whom? Śravaṇaṁ kīrtanaṁ viṣṇoḥ. Viṣṇu and Kṛṣṇa, the same thing.
śravaṇaṁ kīrtanaṁ viṣṇoḥ
smaraṇaṁ pāda-sevanam
arcanaṁ vandanaṁ dāsyaṁ
sakhyam ātma-nivedanam
(S.B.7:5:23)
These nine different process of Kṛṣṇa consciousness movement is being pushed on by the members of Kṛṣṇa conscious society all over the world. And we have opened also here in Bombay, the most important city of India. So we request you all to come every day and try to understand this philosophy of Kṛṣṇa consciousness based on Bhagavad-gītā, Śrīmad-Bhāgavatam, Vedānta-sūtra, Rāmāyaṇa, Mahābhārata, all authentic scriptures.
(Lecture on Bhagavad-Gita------4:12-------by Srila Prabhupada).

So if you simply hear sincerely and submissively, then you will understand Kṛṣṇa. Kṛṣṇa will reveal to you. Śravaṇaṁ kīrtanaṁ viṣṇoḥ smaraṇaṁ pāda-sevanam arcanaṁ vandanaṁ dāsyam, there are different nine kinds of variety. So vandanam, offering prayers, that is also bhakti. Śravaṇam, to hear about it. Just like we are hearing about Kṛṣṇa from this Bhagavad-gītā. Chanting about His glory, Hare Kṛṣṇa. This is the beginning. Śravaṇaṁ kīrtanaṁ viṣṇoḥ (S.B.7:5:23). Viṣṇu means, everything is Viṣṇu. The meditation is Viṣṇu. The bhakti is Viṣṇu. Not without Viṣṇu. And Kṛṣṇa is the original form of Viṣṇu. Kṛṣṇas tu bhagavān svayam (S.B.1:3:28). The original form of the Supreme Personality of Godhead. So if we follow this process then we'll be able to understand without any doubt.
(Lecture on Bhagavad-Gita------6:13-15-------by Srila Prabhupada).

There are many yogis, many different types of yogis. But the best yogi, the foremost yogi, best of all is he... Who? Yoginām api sarveṣāṁ mad-gatena: "Simply in relationship with Me, thinking of Me." Mad-gatenāntar-ātmanā. Within the core of heart, always thinking of Kṛṣṇa. Mad-gata. Yoga process means to concentrate the mind upon the Supreme Personality of Godhead, generally Lord Viṣṇu. So Lord Viṣṇu and Kṛṣṇa, there is no difference. They are the same. Kṛṣṇa is the original Viṣṇu. So the first-class yogi is he who is always concentrating his mind upon Kṛṣṇa. Yoginām api sarveṣāṁ mad-gatenāntar-ātmanā, śraddhāvān. Unless you have got śraddhā, you cannot make any progress. Śraddhā. Śraddhā means faith. Just like you have all came. You have got little faith or more faith. There is faith. Without faith, how you could come here and spare some time for understanding Kṛṣṇa, or hearing about Kṛṣṇa? So this is the beginning, śraddhāvān. Śraddhāvān bhajate yo mām. With faith.
(Lecture on Bhagavad-Gita------7:1-------by Srila Prabhupada).

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: (B.G.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.
(Lecture on Bhagavad-Gita------7:7-------by Srila Prabhupada).