And I will make all my mountains a way, and my highways shall be exalted.
My - all things are God's.
Mountains a way - I will remove all obstructions out of the way (Isaiah 40:4).
Highways shall be exalted - i:e., cast up (Isaiah 57:14; Isaiah 62:10); for instance, over valleys. Vitringa explains "mountains" as great kingdoms-Egypt, Syria, etc.-subjected to Rome to facilitate the spreading of the Gospel: "highways," the Christian doctrine wherein those who join the Church walk, and which, at the time of Constantine, was to be raised into prominence before all, and publicly protected (Isaiah 35:8-9).