The Ecstacy of the Lord and His Devotees
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As far as the incarnation of King Kansa is concerned, this is mentioned in  Srimad Bhagwatam , in the  Vishnu Purana , and in  Mahabharata . It is stated there that the Lord snatched from His Head two kinds of hair: a grey hair and a black hair, and the separate hairs entered into the wombs of two queens of the Yadu dynasty, namely Rohini and Devaki. It is stated there that Lord Krishna descends to this material world for vanquishing all the demons; but some say that Krishna is the incarnation of Vishnu, Who is lying on the ocean of milk within this Universe. Srila Rupa Goswami and his commentator, Sri Valadev Vidya Bihshan, have discussed this point fully, and have established the exact truth. Sri Jiva Goswami also discussed this point in the  Krishna Sandarbha .
When Lord Chaitanya finished his instruction to Sri Sanatan Goswami, Sanatan, being empowered and enlightened, was so transcendentally pleased that he at once fell at the Feet of Lord Chaitanya, and began to speak:
“I am born of a very low family and I have always been in association with lowly people, and therefore I am the lowest of the sinful persons. But You are so kind that You have taught me lessons which are not even understandable by the greatest being, Brahma. And by Your grace I have appreciated the conclusions which You have taught me. But I am so low that I cannot touch even a drop of the ocean of Your instruction. If You therefore want me, who am nothing but a lame man, to dance—then kindly give me Your benediction, by placing Your Feet on my head.”
He prayed for the Lord’s confirmation that the teachings might be actually evolved in his heart, by the grace of the Lord—otherwise there was no possibility of them being described by him. The purport is that  Acharyas , or spiritual masters, are authorized by higher authorities. Instruction alone cannot make one an expert. Unless one is blessed by the spiritual master, or the  Acharya , such teaching cannot become fully manifested. Therefore, one should seek the mercy of the spiritual master, so that the instruction of the spiritual master may develop within himself. After the prayer of Sanatan Goswami, Lord Chaitanya placed His Feet over the head of Sanatan, and gave him benediction, that all the instruction He had given him would develop in him fully.
That was the description of the ultimate stage of love of Godhead. Lord Chaitanya said that such a description cannot be made very elaborately, but He had informed him as far as possible.
CONCLUSION: Anyone who attentively hears these discussions and instructions of Lord Chaitanya to Sanatan Goswami very soon becomes