Having celebrated God for his glory and majesty, she here celebrates him for his mercy, which extends to all, but especially is showed to such as fear him. She certainly respecteth the promise of God to be the God of Abraham and this seed, but declareth this to be most eminently made good to those who are truly pious, all piety being expressed ordinarily in Scripture (especially in the Old Testament) under the notion of the fear of God. We have almost the same words Psalms 103:17. It is elsewhere expressed under the notion of thousands, Exodus 20:6, signifying not only the extent of the Divine goodness to all his people, but the continuance of it for ever.
Related Commentaries of Luke 1:50
Luke 1:50
50 And his mercy is on them that fear him from generation to generation.