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In plain words

"Beyond a wall there was a boundless meadow. Four friends tried to see what lay beyond the wall. One by one they climbed up on it, saw that meadow, laughed aloud, 'Ha ha!', and fell over to the other side. Three of them brought back no news at all. Only one brought news. His body remained even after the knowledge of Brahman, so that he might teach men. So it is with the Avatars and the like.