The concept of "Mystery" in the Bible is not merely a puzzle for the curious; it is a demarcation line between the "profane" and the "initiate." In the Greek New Testament, the word is mystērion (μυστήριον), derived from myein (to close the eyes or lips).
Jesus Christ was absolutely NOT born on December 25th. By using information given to us about the conception and birth of John the Baptist, statements about the conception of Jesus as well as the priestly divisions laid out in Leviticus, we can accurately estimate the Birthday of Jesus to be early to mid September.
The "four winds" refer to the winds emanating from the four cardinal directions, also described as the "four quarters" or "four corners" of the earth or heaven.