Crashfrog,
Good of you to point out the literary meaning (as opposed to the popular) meaning of myth.
I had it explained to me this way. I hope it helps.
There is a story from Nazi Germany that a pastor told his congregation that anyone of Jewish descent would have to leave the church and not come back. Just as soon as he said this the Christ that was on the crucifix in the front of the church got down and walked out of the church. Now the question for us is, did this actually happen, is it literally true? And the answer is that of course it didn't. But is it the TRUTH? Most certainly it is.
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