The Story of the Syamantaka Jewel
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fought like two opposing vultures. Whenever there is an eatable corpse the vultures fight heartily over the prey. Kṛṣṇa and Jāmbavān first of all began fighting with weapons, then with stones, then with big trees, then hand to hand, until at last they were hitting one another with their fists, and the blows were like the striking of thunderbolts. Each was expecting victory over the other, but the fighting continued for days, both in daytime and at night, without stopping. In this way the fighting continued for twenty-eight days.
Although Jāmbavān was the strongest living entity of that time, practically all the joints of his bodily limbs became slackened and his strength reduced to practically nil after being constantly struck by the fists of Śrī Kṛṣṇa. Feeling very tired, with perspiration all over his body, Jāmbavān was astonished. Who was this opponent who was weakening him? Jāmbavān was quite aware of his own superhuman bodily strength, but when he felt tired from being struck by Kṛṣṇa, he could understand that Kṛṣṇa was no one else but his worshipable Lord, the Supreme Personality of Godhead. This incident has a special significance for the devotees. In the beginning, Jāmbavān could not understand Kṛṣṇa because his vision was obscured by material attachment. He was attached to his boy and to the greatly valuable Syamantaka jewel, which he did not want to spare for Kṛṣṇa. In fact, when Kṛṣṇa came there he became angry, thinking that He had come to take away the jewel. This is the material position; although one is very strong in body, that cannot help him understand Kṛṣṇa.
In a sporting attitude, Kṛṣṇa wanted to engage in a mock fight with His devotee. As we have experienced from the pages of the  Śrīmad-Bhāgavatam , the Supreme Personality of Godhead has all the propensities and instincts of a human being. Sometimes, in a sportive spirit, He wishes to fight to make a show of bodily strength, and when He so desires, He selects one of His suitable devotees to give Him that pleasure. Kṛṣṇa desired this pleasure of mock fighting with Jāmbavān. Although Jāmbavān was a devotee by nature, he was without knowledge of Kṛṣṇa while giving service to the Lord by his bodily strength. But as soon as Kṛṣṇa was pleased by the fighting, Jāmbavān immediately understood that his opponent was none other than the Supreme Lord Himself. The conclusion is that he could understand Kṛṣṇa by his service. Kṛṣṇa is sometimes satisfied by fighting also.
Jāmbavān therefore said to the Lord, “My dear Lord, I can now understand who You are. You are the Supreme Personality of Godhead, Lord Viṣṇu, the source of everyone’s strength, wealth, reputation, beauty, wisdom and renunciation.” This statement of Jāmbavān’s is confirmed by the  Vedānta-sūtra , wherein the Supreme Lord is declared to be the source