Lamentations 5 is the last chapter in the book.  Jeremiah ends with a final lament for his people and his culture and the sorry state they are in.  But, he closes with a prayer of trust and restoration.  He says that God remains the same and prays that He will restore their joy.  God is our rock.  He is the same yesterday, today, and tomorrow.  He brings stability into our lives.  He gives us firm footing to stand on for today, and He gives us hope for tomorrow.