That he who blesseth himself; rather, so that he who blesses himself. The sequence of the argument is not altogether clear. Perhaps it is recant that God will call them by his own Name (Amos 9:12)—"the people of God" (Hebrews 4:9); and thence it will become natural for them to use no other name, either when they call for a blessing on themselves, or have to confirm a covenant with others.
In the God of truth; literally, in the God of the Amen; i.e. the God who keeps covenant and promise, to which the strongest formula of consent was the word "Amen" (see Numbers 5:22; Deuteronomy 27:15-26; 1 Kings 1:36, etc.
). Similarly, St. John calls our Lord "the Amen, the Faithful and True Witness" (Revelation 3:14). Because the former troubles are forgotten. When the blessed time has come wherein men call themselves by the Name of the Lord, and know of only one God as the Source of blessing and the confirmation of an oath, then the former state of human affairs, with all its "troubles," will have passed away, and the new era will be inaugurated, which the prophet proceeds to describe at length (verses 17-25).