And I will bless her, and give you a son also of her: yea, I will bless her, and she shall be a mother of nations; kings of people shall come from her.
Read Chapter 17
George Leo Haydock
Bless, and enable her to have a son, who shall also have many children.
Whom. This is referred to Sara, in Hebrew and Chaldean; but to Isaac, in the Syriac. The blessing, at any rate, reverts to the mother; who was a figure of the blessed Virgin Mary, and of the Church; both persecuted with their children; both, in the end, triumphant. (Galatians iv. 23.) (Calmet)