To be born twice is no more strange
than to be born once.
Whether or not you celebrate Christmas as a religious holiday -- I don't -- it seems to me anyone of any faith or lack of faith can use the occasion to contemplate the mystery of birth, physical and (if one chooses) spiritual.
"Our birth is but a sleep and a forgetting," Wordsworth wrote: we forget our prior life or lives. They need to be let go of so we can have a more or less blank screen on which the experiences and lessons of our present existence can be viewed without distraction.
I think a temporary sleep and forgetting are the key to being reborn within this life. They are even tougher than physical birth, which don't (as far as we know) involve much mental struggle. Maybe it is easier, albeit still not easy, if we drop the struggle, don't think of it as effort.
On this day when much of the world recognizes what it believes to have been a divine birth -- or, for that matter, any day -- we can try to let go, if only for an hour, a minute.
Let go of collected resentments.
Let go of righteous anger.
Forgo plans, wishes, even hopes. Close the door on philosophy and theology for a few moments; yes, even your ideas about Christmas.
Put aside noise, distractions, appetites. Hard to do if you are celebrating with kin or friends, but it's possible to find a brief, quiet parenthesis sometime amid the festivity.
Let it all go. Drop out of time. Just be.
Maybe something new will be born in you.