Obedience is better than disobedience to God's word

 Leviticus 26:21-46

If you remain hostile toward me and refuse to listen to me, I will multiply your afflictions seven times over, as your sins deserve.

If in spite of this you still do not listen to me but continue to be hostile toward me,  then in my anger I will be hostile toward you, and I myself will punish you for your sins seven times over.  Then the land will enjoy its sabbath years all the time that it lies desolate and you are in the country of your enemies; then the land will rest and enjoy its sabbaths.  All the time that it lies desolate, the land will have the rest it did not have during the sabbaths you lived in it.

As for those of you who are left, I will make their hearts so fearful in the lands of their enemies that the sound of a windblown leaf will put them to flight. They will run as though fleeing from the sword, and they will fall, even though no one is pursuing them.

But if they will confess their sins and the sins of their ancestors—their unfaithfulness and their hostility toward me, which made me hostile toward them so that I sent them into the land of their enemies—then when their uncircumcised hearts are humbled and they pay for their sin,  I will remember my covenant with Jacob and my covenant with Isaac and my covenant with Abraham, and I will remember the land. For the land will be deserted by them and will enjoy its sabbaths while it lies desolate without them. They will pay for their sins because they rejected my laws and abhorred my decrees. 

The cursing s are more detailed than the blessings: human nature being what it is, fear brings a readier response than love. Yet even after all the disobedience, God still promises to respond to the call of genuine repentance.

Why?

God knew that the man will disobedience to his command, so the curses were happened in Israelite's history. And God's promise is come truth when they turn to the Lord and repent their sins, God blessed them return to the promised land. Restore their country. God is faithful to his people.

How?

Israelite are playing on the stage of human to show God's love and God's faithfulness, they got the blessing from the Lord and received the punishment either. God's covenant is never failed. God's kingdom remain forever.