Because of the mistakes made by the people of Israel, the Lord was silent on them, and they paid for all their mistakes.
The Lord always wanted to teach the people, because only the people looked to Almighty God when they had problems, when the voice of God departed from them.
This is a prayer from Jeremiah to God, so that He would remember the people, the calamities the people were going through, the problems they were going through.
We can see that the prophet makes a tremendous acknowledgment by mentioning these characteristics as far as the Lord was concerned, words about the divine, eternal and unchanging nature of God. His kingdom is great, it is eternal and it lasts for ever and ever.
But, let us remember very clearly that our God does not change. He is the same yesterday, today and for all eternity. The verse that we are going to read next speaks to us these faithful words that Jeremiah said:
Thou, O Lord, remainest for ever; thy throne from generation to generation.
Lamentations 5:19 (KJV)
We must be clear that our God is great and His kingdom lasts forever, it does not end, He will always be, His power and majesty is immense and His glory is endless.
The question is, have you forgotten our Lord? Well, because of what was happening there, the prophet could have asked that question as well and even the people. But it was not like that, seeing another point of view, because we can say that if God had left them completely, they would have seemed, since we know that many were against this people of God.
He is the God of today, He is the same as yesterday, and His kingdom remains forever.