The Church has celebrated Mary’s birth since at least the sixth century. A September birth was chosen because the Eastern Church begins its Church year with September. The September 8 date helped determine the date for the feast of the Immaculate Conception on December 8 (nine months earlier).
Blessed are you, holy Virgin Mary, deserving of all praise;
from you rose the sun of justice, Christ our God.
According to tradition, Anna and Joachim were infertile but prayed for a child. They receive the promise of a child that will advance God’s plan of salvation for the world. Mary’s birth signaled the end of the old covenant between God and his people, which reached fruition through Moses leading the people of Israel into the promised land. With the birth of Mary God begins history anew, this time with Jesus leading us not to the promised land but rather to the kingdom of God leading to eternal life.
Holy Mary, Mother of God, pray for us!