Synopsis of the Books of the Bible, by John Nelson Darby, [1857-62], at sacred-texts.com
The following commentary covers Chapters 55, 56, and 57.
Chapters 55, 56, 57 are exhortations given in view of these things. Chapter 55 is full free grace, which consequently embraces the Gentiles. For this reason it can be applied as a principle to the gospel. Its accomplishment will be in the time of blessings to the earth through the Lord's presence. Chapter 56 gives the moral character that is necessary to enjoy the blessing, which is no longer according to the narrow legal principles of former days. His house shall in fact be a house of prayer for all those whose hearts are truly turned unto the God of Israel; and they shall be joyful in it. Chapter 57 denounces (we may say, on the same principle) those even in Israel who morally walk contrary to the will of God. The righteous might perish. But it would only be taking them from the evil to come. But whether it were Israel or not, there would be no peace for the wicked. These three chapters then give the moral instruction that belongs to those days. The faithful shall be blessed, and the meek, be they who they may; the wicked shall be judged, whether of Israel or not. Thus closes, as I have said, with chapter 57 the second subdivision of this part of the prophecy.