My interpretation is this:
The gods wanted to hide the truth of the universe from people. They couldn't find the right place until the third god, who knew the human nature best, suggested the human neck as the right place. He knew that humans always want to find out everything about the world around them and they would find the truth of universe if it were hidden anywhere outside them. He also knew that humans are not inclined to look for the truth in themselves. Thus, the best place to hide it is on their bodies, where they won't ever try to look for it.
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