From John Piper’s Good News of Great Joy (a free e-book download):
“Mary and Elizabeth are wonderful heroines in Luke’s
account. He loves the faith of these women. The thing that
impresses him most, it appears, and the thing he wants to
impress on Theophilus, his noble reader, is the lowliness and
cheerful humility of Elizabeth and Mary.
Elizabeth says,“Why is this granted to me that the mother of
my Lord would come to me?” (Luke 1:43). And Mary says, “He
has looked on the humble estate of his servant” (Luke 1:48).
The only people whose soul can truly magnify the Lord are
people like Elizabeth and Mary—people who acknowledge
their lowly estate and are overwhelmed by the condescension
of the magnificent God.”