But Jerusalem which is above is free, which is the mother of us all.
Read Chapter 4
Ambrosiaster
AD 400
Jerusalem, which he calls our mother, represents the Lord’s mystery, through which we are reborn into freedom, just as she is free. And she is called heavenly because heaven is her seat. Those to whom she gives birth will be there with her.
But Jerusalem which is above is free, which is the mother of us all. The Christian Church, typified by Sarah, the mistress, is contrasted with the Jewish synagogue, typified by Hagar, the bondwoman, in four points: It is above; it is Jerusalem; it is free; it is a fruitful mother.
1. Why is it said to be above? Because (a) Christ, its Head, descended from heaven, and thither ascended to rule the Church from above. (b) Because the Church is perfected by heavenly things, faith, hope, and charity, which come from above (c) Because, the efficacy of the Sacraments is from above, and shows God Himself present in His Church, as though He had come down from above. (d) Because her conversation is in heaven, and there with her Spouse are her heart and treasure. (e) Because she is striving for her eternal crown laid up in heaven. Cf. Revelation 21:2.
2. Why is she called Jerusalem? Because Jerusalem means the vision of peace. This God provides for His Church, so that she rejoices, not in earth...
"If ye hasten to fly out of Egypt, and repair beyond the Red Sea into the wilderness "that is, from earthly intercourse to the Jerusalem above, which is the mother of the living;
One and the same Jerusalem can be understood in a fourfold way: historically as the city of the Jews, allegorically as the church of Christ, anagogically as the heavenly city of God, which is the mother of all, and tropologically as the human soul, which is often upbraided or praised under this name by the Lord. .
Those therefore, who are born of her are not bondmen. Thus the type of the Jerusalem below was Hagar, as is plain from the mountain being so called; but of that which is above is the Church. Nevertheless he is not content with these types, but adds the testimony of Isaiah to what he has spoken. Having said that Jerusalem which is above is our Mother, and having given that name to the Church, he cites the suffrage of the Prophet in his favor,
Which, if you carefully study, you will find to be the means of building you up in that faith which has been given you, and which, being followed by hope, and preceded by love towards God, and Christ, and our neighbour, "is the mother of us all."
Which the apostle also calls "our mother from above; ".
I find it was in their foresight of all this, that the heavenly intelligences gazed with admiration on "the Jerusalem which is above"