Of all the yogis, the yogi who is always thinking of Kṛṣṇa with love and faith... It is not very difficult. Kṛṣṇa says, "He is first-class yogi." So how to become the first-class yogi, that is described in this Seventh Chapter of the Bhagavad-gītā. Kṛṣṇa says personally. If you want to understand God, it is better to understand from God Himself. Instead of speculating what is God, better to understand God from the words of God.
So Kṛṣṇa is accepted by the... Just like Vyāsadeva. Vyāsadeva is the compiler of all Vedic knowledge. He accepts Kṛṣṇa, (as) the Supreme Personality of Godhead. Later on, all the ācāryas—Rāmānujācārya, Madhvācārya, Viṣṇu Svāmī, Lord Caitanya—they have all accepted Kṛṣṇa. So far our Vedic culture is concerned, Kṛṣṇa is the Supreme Personality of Godhead. Here it is also said, śrī bhagavān uvāca. So He is teaching how to become first-class yogi in Kṛṣṇa consciousness. That is His teaching. He is saying, mayy āsakta-manāḥ pārtha yogaṁ yuñjan mad-āśrayaḥ. Mayi, "unto Me," āsakta, "attachment." The Kṛṣṇa consciousness yoga means to increase the attachment for Kṛṣṇa. That's all. We have got attachment for something, every one of us. So everyone has got attachment, either for His family, either for some friend or for some house or some hobby or for some cats, some dogs. There is attachment. That is not to be learned. We cannot... There is no need of explaining what is attachment. Attachment is there, existing in everyone's heart. He wants to be attached to somebody else or he... Everyone wants to love somebody else. Love does not mean oneness. Love must be two, the lover and the beloved. So attachment is there. That is natural. Everyone knows. Now, this yoga system, Kṛṣṇa consciousness yoga system, means to increase your attachment for Kṛṣṇa. That's all.