In three prophecies in the unit of prophecies of consolation, Yirmiyahu foresees the changes that will take place at the time of the redemption.
The first prophecy deals with Israel being replanted in their land and the new relationship between the actions of the fathers vs. the consequences to the sons.
The second prophecy deals with a new covenant and its consequences. The difference between the old covenant and the new one relates not to the contents or to the addressee, but to the manner in which it will be made and its consequences.
The prophet contrasts the old covenant that was broken by the people and the new covenant that apparently will not be broken because it will be engraved on the hearts of the people. One of the general motifs in the book of Yirmiyahu is the internalization of holiness and opposition to the formal, mechanical conception of holiness. Standing out against this in many places in the book of Yirmiyahu is prayer and moral deeds as a condition for holiness. The underlying problem with the tablets of the covenant and ark is their remoteness from the people, which allows people to escape from them. The removal of the ark and the transfer of its contents inwards into the hearts of the people will create the desired change and turn the covenant into an eternal covenant.
The third prophecy addresses the rebuilding of Jerusalem which will be holy to the Lord and will not be plucked up again forever.
Abridged and adapted by HaTanakh.com Staff. For further reading, see the full article.