14 [43] Even before his birth, Jesus is identified in Luke as the Lord.
15 [45] Blessed are you who believed: Luke portrays Mary as a believer whose faith stands in contrast to the disbelief of Zechariah (Luke 1:20). Mary's role as believer in the infancy narrative should be seen in connection with the explicit mention of her presence among "those who believed" after the resurrection at the beginning of the Acts of the Apostles (Acts 1:14).
13 [36-37] The sign given to Mary in confirmation of the angel's announcement to her is the pregnancy of her aged relative Elizabeth. If a woman past the childbearing age could become pregnant, why, the angel implies, should there be doubt about Mary's pregnancy, for nothing will be impossible for God.