Three Moments in Our Lady's Life, Sermon by Fr. Paul Robinson, SSPX

The Assumption of Our Lady into Heaven was the effect of the way that she lived her life and, particularly, three moments of her life: the moment of Our Lady’s conception, the moment she became Mother of God, and the moment of her Son’s death.Immaculate Conception
The moment of her conception is important because it is the first moment of her existence, the time of the creation of her soul and the making of her body. It was the first moment of the existence of the body that would one day rise from the dead and be taken up to Heaven.We know that the most important aspect of this moment is that God preserved her entire person from sin. Her body was taken from two souls afflicted by original sin, Joachim and Anna, but God prevented her soul from contracting any sin. As a result, we can speak of her body as being sinless as well, as having no contact with sin.You know that sin is the thing that causes death. And death is the thing that causes the corruption and destruction of our body. But God prevented this cause of death from touching Our Lady, at the first moment of her existence.Mother of God
This blessed creature, who was conceived without any sin, began to grow up. She maintained the purity of body and soul that God had given to her. She was perfectly faithful to her gifts. She did not commit any sin. She lived in humble submission to God.This behavior, this holiness prepared her to become God’s mother. It prepared her to receive into her body God Himself. And of course, that was what happened on the day of the Annunciation. Her body changed. God both came inside of her and gave her the power to form His body from her body.Her pure body became the source of the body of God.Co-Redemptrix
Our Lord was born and she named Him Jesus or Savior, because He was to save the world from its sins by an act of Redemption.