Luke 1:49 - Coke's Commentary on the Holy Bible

Hath done to me great things;— Μεγαλεια, miracles. So Μεγαλα and Μεγαλεια often signify in the Old Testament, being often applied to the miracles wrought in Egypt, and in the wilderness. See Deuteronomy 10:21; Deuteronomy 11:7; Deuteronomy 34:12. Doubtless, Mary had now in her thoughts the miraculous conception of the Messiah. She adds, and holy is his name, making this remark to signify her humble faith in God's wisdom and goodness. She was astonished that God should have chosen her, a person of the meanest condition, to be the mother of the Messiah; yet, from her belief of the divine perfections, she was convinced that all was done in wisdom and truth.