Martin Luther writes:
Mary confesses that the foremost work God did for her was that He regarded her, which is indeed the greatest of His works, on which all the rest depend and from which they all derive. For where it comes to pass that God turns His face toward one to regard him, there is nothing but grace and salvation, and all gifts and works must follow.
[We pray] that God would lift up His countenance upon us, that He would not hide His countenance from us, that He would make His face shine upon us, and the like. And that Mary herself regards this as the chief thing, she indicates by saying:
Behold, since He has regarded me, all generations will call me blessed.
Note that she does not say men will speak all manner of good of her, praise her virtues, exalt her virginity or her humility, or sing of what she has done. But for this one thing alone, that God regarded her, men will call her blessed.*
There is comfort in the Word of God:
The Lord bless you and keep you;
the Lord make his face to shine upon you and be gracious to you;
the Lord life up his countenance upon you and give you peace.
Numbers 6:24-26
* Quoted in Treasury of Daily Prayer,
624-626