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. 

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?