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Every high tower - Towers, or fortresses, were erected for defense and protection. They were made on the walls of cities, for places of observation (compare the note at Isaiah 21:5), or in places of strength, to be a refuge for an army, and to be a point from which they might sally out to attack their enemies. They were “high” to afford a defense against being scaled by an enemy, and also that from the top they might look abroad for observation; and also to annoy an enemy from the top, when the foe approached the walls of a city.

Every fenced wall - הומה בצוּרה betsûrâh hômâh The word “fenced,” בצוּרה betsûrâh is from בצר bâtsar to make inaccessible, and hence, to fortify. It denotes a wall that is inaccessible, or strongly fortified. Cities were commonly surrounded by high and strong walls to defend them from enemies. The sense is, God would overturn all their strong places of refuge and defense.

The taking of Jerusalem by the Chaldeans seems first meant here, when idolatry among the Jews was done away; but our thoughts are led forward to the destruction of all the enemies of Christ. It is folly for those who are pursued by the wrath of God, to think to hide or shelter themselves from it. The shaking of the earth will be terrible to those who set their affections on things of the earth. Men's haughtiness will be brought down, either by the grace of God convincing them of the evil of pride, or by the providence of God depriving them of all the things they were proud of. The day of the Lord shall be upon those things in which they put their confidence. Those who will not be reasoned out of their sins, sooner or later shall be frightened out of them. Covetous men make money their god; but the time will come when they will feel it as much their burden. This whole passage may be applied to the case of an awakened sinner, ready to leave all that his soul may be saved. The Jews were prone to rely on their heathen neighbours; but they are here called upon to cease from depending on mortal man. We are all prone to the same sin. Then let not man be your fear, let not him be your hope; but let your hope be in the Lord your God. Let us make this our great concern.