Deuteronomy 11:28 And a curse, if ye will not obey the commandments of the Lord your God, but turn aside out of the way which I command you this day, to go after other gods, which ye have not known.
God gave the Commandments to us in order to bless us and give us a good life if we obey. But the opposite response, disobeying and turning aside, brings a curse and a life that is not so good. Blessing or curse is the result of obedience or disobedience. It is a consequence, not a reward or punishment. The outcome is not arbitrary (God will get you for that), but it is a principal built in to Creation and Life. Following the Rules produces a blessed life; Breaking the Rules a cursed life. God gave the Law for our good.
It is good, right, salutary, pleasant, beneficial, and productive to live according to God’s Word. Marriage and family life, community and social life, social and business interactions, personal health and wellbeing all run smoother, are more joyful and satisfying, and, in a word, blessed when we learn obedience to God, for He has our best interests in mind. But when things turn out badly in our physical, mental, emotional, business, social, and family life we have only ourselves to blame. Bad things come from our fault, our sin, our self. The world can only neglect, ignore, despise, reject, and deny God so long before it all falls apart.
Even though we brought the curse upon ourselves, God still loves us and wants the best life for us. So He sent His Son to live for us and die for us, thereby allowing the Lord to bless us with life. We respond with repentance, faith, and thanks.