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Kṛṣṇa, the Supreme Personality of Godhead
He learned the art of questioning and answering by immediately composing poetry within His mind. He learned the science of the action and reaction of physical combinations and permutations. He learned the art of a psychiatrist, who can understand the psychic movements of another person. He learned how to satisfy one's desires. Desires are very difficult to fulfill; but if one desires something which is unreasonable and can never be fulfilled, the desire can be subdued and satisfied, and that is an art. By this art one can also subdue sex impulses when they are aroused, as they are even in  brahmacārī  life. By this art one can make even an enemy his friend or transfer the direct action of a physical element to other things.
Lord Kṛṣṇa and Balarāma, the reservoir of all knowledge of arts and sciences, exhibited Their perfect understanding when They offered to serve Their teacher by awarding him anything he desired. This offering by the student to the teacher or spiritual master is called  guru-dakṣiṇā . It is essential that a student satisfy the teacher in return for any learning received, either material or spiritual. When Kṛṣṇa and Balarāma offered Their service in this way, the teacher, Sāndīpani Muni, thought it wise to ask Them for something extraordinary, something which no common student could offer. He therefore consulted with his wife about what to ask from Them. They had already seen the extraordinary potencies of Kṛṣṇa and Balarāma and could understand that the two boys were the Supreme Personality of Godhead. They decided to ask for the return of their son, who had drowned in the ocean on the bank of Prabhāsakṣetra.
When Kṛṣṇa and Balarāma heard from Their teacher about the death of his son on the bank of Prabhāsakṣetra, They immediately started for the ocean on Their chariot. Reaching the beach, They asked the controlling deity of the ocean to return the son of Their teacher. The ocean deity immediately appeared before the Lord and offered Him all respectful obeisances with great humility.
The Lord said, "Some time back you caused the drowning of the son of Our teacher. I order you to return him."
The ocean deity replied, "The boy was not actually taken by me, but was captured by a demon named Pañcajana. This great demon generally remains deep in the water in the shape of a conchshell. The son of Your teacher might be within the belly of the demon, having been devoured by him."
On hearing this, Kṛṣṇa dove deep into the water and caught hold of the demon Pañcajana. He killed him on the spot, but could not find the son of His teacher within his belly. Therefore He took the demon's dead body (in the shape of a conchshell) and returned to His chariot on the beach of