The following words of Jeremiah are echoed later in the words of Paul.

Lam 3:40
Let us examine our ways and test them, and let us return to the LORD.
2 Cor 13:5
Examine yourselves to see whether you are in the faith; test yourselves. Do you not realize that Christ Jesus is in you-- unless, of course, you fail the test?

Earlier God had told the people that there would come a time that He would not listen to them.

Lam 3:44
You have covered yourself with a cloud so that no prayer can get through.

Have we as Believers in Jesus “covered ourselves with a cloud”? If so how have we done that?

Lam 4:10
With their own hands compassionate women have cooked their own children who became their food...
This very thing was foretold in Ezekiel 5.

We are told that God's wrath was poured out on the people because of the sins of the prophets and the iniquities of the priests. It is very clear throughout Scripture that God holds spiritual leaders to account.

Even though much of Jeremiah’s lamentations are indeed expressions of grief, he includes this most wonderful of Scriptures.

Lam 3:22-23
Because of the LORD's great love we are not consumed, for his compassions never fail. They are new every morning; great is your faithfulness.

What a great verse for us to ponder.