From the Office of Readings today:
It seems to me that the birth referred to here is our salvation, as is suggested by the prophet Isaiah. This reaches its full term and is not stillborn when, having been conceived by the fear of God, the soul’s own birth pangs bring it to the light of day. We are in a sense our own parents, and we give birth to ourselves by our own free choice of what is good. Such a choice becomes possible for us when we have received God into ourselves and have become children of God, children of the Most High. On the other hand, if what the Apostle calls the form of Christ has not been produced in us, we abort ourselves. The man of God must reach maturity.
-St Gregory of Nyssa-