Jesus has been speaking of the house of Israel in the future, and now brings it back, at least tangentially, to those in the congregation around him. This is the land of their inheritance. They will be preserved upon the land according to the covenant of the land. Through righteousness, they will be blessed.
The Gentiles appear to also inherit that blessing of the land, for they too will prosper only upon principles of righteousness. If the house of Israel is righteous, and the Gentiles are not, Jesus had said that the house of Israel would rise up against the Gentiles.
To punctuate the blessing of the land, and the blessing on the New World branch of the house of Israel, Jesus cites Isaiah 52:8–10. There will be redemption and reconciliation after a time of destruction visited upon the house of Israel. It will be well.
This is the end of a chapter in the 1830 edition.