The Lord wanted Jeremiah to see the work of the potter with the clay, for if he understood this, he would understand much of the work of the Lord with His people.
The message of Haggai, chapter two, is a message of coming glory (see Haggai 2:3, 7, 9; compare 1:8). The importance of the message is shown in the time in which it was given.
The Levitical sacrificial system had five separate and distinct offerings that could be made to the Lord.
It is not enough that the offering is brought; it must be acceptable to God. God must receive it.
We drift away from the Lord. We turn from Him and His ways in rebellion. This brings on His chastening hand. We feel that there is no way back. But God gives a way. Come home. Come back to your Saviour and God.