When we partake of the cup of wine at Passover, we usually think of Christ's blood shed for sins. However, the cup and its contents have another meaning for us.
The situation that faced God's prophet, Jeremiah, and his scribe, Baruch, in the last days of Judah's monarchy was one of depravity and despair.
Prophets, even though they may bring new messages, stay consistent with existing Scripture and doctrine as they speak on behalf of God.
Lamentations 3 and 4 show the stark contrast of a once proud people (secure in their wealth, technology, and cleverness) suffering bitter humiliation.