Our God is a God of covenant.
By His name, Yahweh, He entered into covenant with the children of Israel.
As they prepared to enter the Promised Land, God renewed His covenant with them.
The book of Deuteronomy is the document of that renewal, and it is laid out in the form of a covenant.
In Deuteronomy 28, God proclaimed a list of blessings and curses.
If His people obeyed His voice and kept His commandments, they would experience the blessings of God in every single area of their lives.
Read Deuteronomy 28:1-14
If the people of Israel chose not to hear the voice of the Lord or obey His commands, they would not experience His blessings.
Outside the blessing, there is nothing left but the curse. Read Deuteronomy 28:15-68
Sicknesses and diseases belong to the curse, not to the blessing.
This required a choice for the people of God.
Read Deuteronomy 30:19,20.
Outside the covenant blessing, there is nothing to look forward to except all of the curse.
But for those who choose life and blessing, life is completely different.
Living in the blessing of God can bring health, wholeness, prosperity and peace.
God gives the choice, "I have set before you life and death, blessing or cursing", then He even reveals the answer: "Therefore, choose life."