(This is the little homily I gave to the remnant of the brethren this morning.)
"This is how the birth of Jesus Christ came about...his mother Mary...was found with child through the Holy Spirit." (Mt 1:18)
The Church was born in the same way, when the same Spirit filled the house where the apostles were gathered after the Ascension.
And every Sunday, even every day, the Church--we as Church--are regenerated right here by the Eucharist.
Just as God opened the side of Adam to form Eve, mother of all the living, so with the water and blood flowing from the side of Jesus--opened by our violence--all those brought back to life come to be fed.
This is the good news of our faith; in Christ crucified, God has transformed the violence of sin into the source of salvation. We, reborn in the same Christ conceived by the Holy Spirit in the womb of Mary, filled with the same Spirit, come to be washed and fed from the wounds of the Son become man. This is why we pray in today's Collect--the same prayer we pray three times a day in the Angelus--that the Passion and Cross of the Lord would bring us the glory of the Resurrection.
In these days, when we celebrate with joy the birth among us of the Son of God, we celebrate in the same way our regeneration in the Holy Spirit as the Church--the Body of Christ--as well as our daily and eucharistic rebirth, as John says, "not by water alone, but by water and blood." (1 Jn 5:6)
His conception in the womb of Mary is the dawn of our regeneration, his birth our rebirth.