consider the One who loved you so much that He gave Himself for you. He deserves your love. Give it to Him and give it to Him undivided.
We must have a heart for fallen brothers and sisters.
We have received the call to be ambassadors for Christ.
A covenant is a solemn agreement. The most important covenants in the Bible are those in which God makes a covenant with man: the Abrahamic Covenant, the Davidic Covenant, etc. Here is a covenant which man makes with God. The Israelites recognize the importance of God and covenant together to wholly follow Him.
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.
