Chapter 5 describes the humiliation of judgment, but in the end, Jeremiah comes to another flash of insight (verse 19):
But thou, O Lord, dost reign for ever;
thy throne endures to all generations. (Lamentations 5:19 RSV)
What does this mean? Well, it means that though man may even perish in sorrow, God endures. And because God endures, the great purpose and workings of God endure. God never does anything temporarily; all that he does endures forever.Jeremiah sees that what God has taught him in his grief will have a practical use. Even if he were to die in the midst of his grief, God’s purposes endure. God is simply preparing now for a work yet to come. God is not limited by time. He is eternal. His throne, his authority, endures to all generations. In practical terms, the prophet is realizing that after he has been through this time of grief, he will have learned a truth about God that will make him absolutely impervious to any other kind of test. Once he has been through this, nothing can reach him, nothing can upset him, nothing can trouble him, nothing can touch him or overthrow him. He is now ready for anything. And in God’s great purpose there will be an opportunity to use that strength.