Isaiah 10:12

When the Lord hath performed His whole work upon Mount Zion

God’s two-sided providence

1.

God designed to do good to Zion and Jerusalem by this providence. When God lets loose the enemies of His Church and people, and suffers them for a time to prevail, it is in order to the performing of some great good work upon them; and when that is done, then, and not till then, He will work deliverance for them.

2. When God had wrought this work of grace for His people, He would work a work of wrath and vengeance upon their invaders. (M. Henry.)

Stoutness of heart

The “stout heart” here threatened is entirely different from true magnanimity or greatness of mind, arising from good principles and accompanied with other virtues, which excites to the most laudable and renowned actions. It is an odious, stubborn disposition, which acts in direct contrariety to lowliness of mind and poverty of spirit, whereby people are inclined to think modestly of their abilities and performances; it proceeds from pride, is strengthened by external grandeur and dignity, and discovered by vain self-conceit and foolish boasting of past exertions and successes, and future intended enterprises. The fruit of the king of Assyria’s stout heart was a daring expedition against Jerusalem, undertaken in proud contempt of the true God, and accompanied with blasphemous insults, repeatedly offered to the Most High over all the earth. (R. Macculloch.)

Penalty in apparent success

When the scum is at highest, it falls in the fire. (J. Trapp.)