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Krṣṇa,  the Supreme Personality of Godhead
never cares for any good instruction. He is just like a determined thief: one can give him moral instruction, but it will not be effective. Similarly, those who are demoniac or atheistic by nature can hardly assimilate any good instruction, however authorized it may be. That is the difference between demigod and demon. Those who can accept good instruction and try to live their lives in that way are called demigods, and those who are unable to take such good instruction are called demons. Failing in his attempt to pacify Kaṁsa, Vasudeva wondered how he would protect his wife Devakī. When there is imminent danger, an intelligent person should try to avoid the dangerous position as far as possible. But if, in spite of endeavoring by all intelligence, one fails to avoid the dangerous position, there is no fault on his part. One should try his best to execute his duties, but if the attempt fails, he is not at fault.
Vasudeva thought of his wife as follows: “For the present let me save the life of Devakī, then later on, if there are children, I shall see how to save them.” He further thought, “If in the future I get a child who can kill Kaṁsa—just as Kaṁsa is thinking—then both Devakī and the child will be saved because the law of Providence is inconceivable. But now, some way or other, let me save the life of Devakī.”
There is no certainty how a living entity contacts a certain type of body, just as there is no certainty how the blazing fire comes in contact with a certain type of wood in the forest. When there is a forest fire, it is experienced that the blazing fire sometimes leaps over one tree and catches another by the influence of the wind. Similarly, a living entity may be very careful and fearful in the matter of executing his duties, but it is still very difficult for him to know what type of body he is going to get in the next life. Mahārāja Bharata was very faithfully executing the duties of self-realization, but by chance he contacted temporary affection for a deer, and he had to accept his next life in the body of a deer.
Vasudeva, after deliberating on how to save his wife, began to speak to Kaṁsa with great respect, although Kaṁsa was the most sinful man. Sometimes it happens that a most virtuous person like Vasudeva has to flatter a person like Kaṁsa, a most vicious person. That is the way of all diplomatic transactions. Although Vasudeva was deeply aggrieved, he presented himself outwardly as cheerful. He addressed the shameless Kaṁsa in that way because he was so atrocious. Vasudeva said to Kaṁsa, “My dear brother-in-law, please consider that you have no danger from your sister. You are awaiting some danger because you have heard a prophetic voice in the sky. But the danger is to come from the sons of your sister, who are not present now. And who knows? There may or may not be sons in the future.