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Krṣṇa Consciousness: the Topmost Yoga System
This topmost  yoga  system was described by Krṣṇa in the  Gūtā  to His most intimate friend, Arjuna. In the beginning, the Lord said that this system can be practiced only by a person who has developed attachment for it. This Krṣṇa conscious  yoga  system cannot be practiced by an ordinary man who has no attachment for Krṣṇa, for it is a different system, and the topmost— bhakti-yoga .
There are five types of direct attachment, and there are seven types of indirect attachment. Indirect attachment is not  bhakti . Direct attachment is called  bhakti . If you are attached to Krṣṇa by the direct method, it is called devotional service, and if you are attached to Krṣṇa by an indirect method, it is not devotional service. But that is also attachment. King Kamsa, for example, was the maternal uncle of Krṣṇa; and there was a warning that Kamsa would be killed by one of his sister's sons. So he became very anxious about the sons of his sister, and he decided to kill his sister. Devakī, Krṣṇa's mother, was saved by her husband, Vasudeva, who made a compromise and proposed to his brother-in-law as follows: "You are afraid of the son of your sister. So your sister herself is not going to kill you." He requested, "Don't kill your sister. Save her, and I promise that all the sons born of her will be brought to you, and if you like you can kill them."
Vasudeva did this in order that his poor wife might be saved. And Vasudeva thought, "When Devakī's son is born, Kamsa may have a change of heart." But Kamsa was such a great demon that he killed all the sons of Devakī. It was told that the eighth son of the sister would kill him. So, when Krṣṇa was in the womb of His mother, Kamsa was always thinking of Krṣṇa. You may say that he was not Krṣṇa conscious, but actually he was. Not directly, not for love's sake; but as an enemy. He was Krṣṇa conscious as an enemy. So, that is not devotional service. One in devotional service is Krṣṇa conscious as Krṣṇa's friend, Krṣṇa's servant, His parent, or His lover.