The only mystery to me is how some come to the conclusions they reach when reading Paul.
Paul liked to use the word didn’t he?
But, that we will no agree on what is means is no mystery.
He liked to use the word “mystery” because the “mysteries” were given to him to give to us by direct revelations of the risen Christ. He could not be clearer in what he meant. The only way to miss it is because a person chooses NOT to see it.