The kings of the earth did not believe, nor any people of the world, that an enemy or a foe could enter the gates of Jerusalem.
He confirms the same thing; for when a thing incredible happens, either we are extremely stupid, or we must be moved and affected. The Prophet, then, now says that the destruction of the city of Jerusalem had been incredible, because God had defended it by his power; it was also so fortified that no one believed that it could be taken, and the grandeur of the city was known everywhere.
The elegy in this chapter begins with a lamentation of the very sad and doleful change which the judgments of God had made in Jerusalem. The city that was formerly as gold, as the most fine gold, so rich and splendid, the perfection of beauty and the joy of the whole earth, has become dim, and is changed, has lost its lustre, lost its value...
Commenting on Lamentations 4:1-12
The kings of the earth, and all the inhabitants of the world,.... Not only the neighbouring nations, and the kings of them, but even such in all parts of the world that knew anything of Jerusalem: would not have believed that the adversary and the enemy would have entered into the gates of Jerusalem; when it was besieging, they did not believe it would be...