Isaiah 54 - G. Campbell Morgan's Exposition on the Whole Bible

We now come to the section which deals with the triumphant singing resulting from the work of the Servant of God, and this chapter is the song of assurance. It first sets forth the glorious fact of restoration. The people, forsaken on account of their own sin, are to be restored to the sacred relationship to Jehovah, in which He is the husband. The borders are to be enlarged in order that the growth of the people may find room, and all this because the end of forsaking has come. It must not be forgotten that this song of restoration follows immediately the description of the suffering and triumph of the Servant of God.

The second half of the song describes the glory of restoration. The city is to be rebuilt in material magnificence. Its life is to be conditioned in moral rectitude. The children are to be taught of Jehovah. The civic strength is to be righteousness, and all oppression is to be banished.

Finally, the reconstituted people are to be impregnable. No enemy will be able to gain an a vantage over them, and no weapon formed against them shall prosper.