Isaias 54:5

But let us now hear what follows about the Church. He says, “Rejoice, O barren, thou that barest not; break forth and cry, thou that didst not travail with child: for many more are the children of the desolate than of her that has an husband.” But these must suffice; and some things in them ought to be expounded; yet I think those parts sufficient which are so plain that even enemies must be compelled against their will to understand them.

47. Wherefore let those evil applauders of Christ, who refuse to become Christians, desist from making the allegation that Christ did not teach that their gods were to be abandoned, and their images broken in pieces. For the God of Israel, regarding whom it was declared aforetime that He should be called the God of the whole earth, is now indeed actually called the God of the whole earth. By the mouth of His prophets He predicted that this would come to pass, and by Christ He did bring it eventually to pass at the fit time. Assuredly, if the God of Israel is now named the God of the whole earth, what He has commanded must needs be made good; for He who has given the commandment is now well known. …

8. “For God is the King of all the earth” ( ver. 7 ). What? And before was He not God of all the earth? Is He not God of both heaven and earth, since by Him surely were all things made? Who can say that He is not his God? But not all men acknowledged Him their God; and where He was acknowledged, there only, so to say, He was God. “In Judah is God known.” Not yet was it said to the sons of Korah, “O clap your hands, all ye nations.” For that God known in Judah, is King of all the earth: now by all He is acknowledged, for that is fulfilled which Isaiah saith, “He is thy God who hath delivered thee, the God of the whole earth shall He be called.” “Sing ye praises with understanding.” He teacheth us and warneth us to sing praises with understanding, not to seek the sound of the ear, but the light of the heart. …

20. “Blessed be the Lord God of Israel, who hath done wonderful things alone” ( ver. 18 ). Contemplating all things above spoken of, a hymn bursteth forth; and the Lord God of Israel is blessed. For that is being fulfilled which hath been spoken to that barren woman, “and He that hath delivered Thee, the God of Israel, shall Himself be called of the whole earth.” “He doeth” Himself “marvellous things alone:” for whosoever do them, He doth Himself work in them, “who doeth wonderful things alone.” “And blessed be the name of His glory for everlasting, and for age of age” ( ver. 19 ). …

6. “They have poured forth their blood like water,” that is, abundantly and wantonly, “in the circuit of Jerusalem” ( ver. 3 ). If we herein understand the earthly city Jerusalem, we perceive the shedding of their blood in the circuit thereof, whom the enemy could find outside the walls. But if we understand it of that Jerusalem, concerning whom hath been said, “many more are the sons of her that was forsaken, than of her that hath the husband,” the circuit thereof is throughout the universal earth. …