^{Gal. 1 8}But even if we or an angel from heaven should preach a gospel other than the one we preached to you, let him be eternally condemned! ⁹As we have already said, so now I say again: If anybody is preaching to you a gospel other than what you accepted, let him be eternally condemned! "

The OT curses were part of the creation ordinance.  God created man and established his purpose in the creation ordinance. Every man was given a free will to rule the earth. God established mans authority on the earth through His law. God has given each man the desire to rule without opposition according to Gods purposes. We find this creation ordinance in the days of creation. For six days God creates and on the seventh day He rest. (The seventh day being the curses and the blessing coming together...our authority is established absolutely. Its defined in the OT as rest.) God established His law by the work that He accomplished on the 6 days of creation. His law blesses Gods elect and it curses the wicked. 3 ¹⁴He redeemed us in order that the blessing given to Abraham might come to the Gentiles through Christ Jesus, so that by faith we might receive the promise of the Spirit." ¹⁰All who rely on observing the law are under a curse, for it is written: "Cursed is everyone who does not continue to do everything written in the Book of the Law." In the creation ordinance God has renewed the earth by Christ taking the curse upon Himself.  ¹³Christ redeemed us from the curse of the law by becoming a curse for us, for it is written: "Cursed is everyone who is hung on a tree."

In the new creation man is restored to His original purpose in ruling over creation. Where as man in the garden was free to obtain all that he desired, now he must overcome the opposition. The way that man overcomes the opposition is to be in Christ who established mans authority over the opposition in the relationship of Father and son.  ²⁶You are all sons of God through faith in Christ Jesus, ²⁷for all of you who were baptized into Christ have clothed yourselves with Christ. ²⁸There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus. ²⁹If you belong to Christ, then you are Abraham's seed, and heirs according to the promise." In other words God returns us to the former blessing and success that He purposed in giving man ruler-ship of His creation. But God also established a new relationship to His law. We are no longer ²⁵Now that faith has come, we are no longer under the supervision of the law." We are led to Christ using the law as an instrument of death. ²⁴So the law was put in charge to lead us to Christ^F14 that we might be justified by faith. ²⁵Now that faith has come, we are no longer under the supervision of the law." He is saying that as we use the law to destroy the opposition because we are declared righteous in Christ , we stand on the other side of the law. (No longer under the supervision.) You see the law pronounces death on all law breakers but we are raised to new life in Christ and now we are related to a loving Father who is the Judge.

This is why the apostle acted as a prophet in extending the curse to the whole world. Because the gospel has spread to the ends of the earth. Just like the apostle teaches that we are grafted into the OT blessing of Gods people, ¹⁴He redeemed us in order that the blessing given to Abraham might come to the Gentiles through Christ Jesus"... so the apostle pronounced the curse upon all who preached another gospel1 8b.If anybody is preaching to you a gospel other than what you accepted, let him be eternally condemned! "

When Paul extended the curses to the ends of the earth, the law that was  given by Moses that pronounces death to all law breakers outside of Christ became a universal standard. 3  ²⁴So the law was put in charge to lead us to Christ^F14 that we might be justified by faith." The apostle is teaching that we cannot know Christ through the curse. We cannot curse Christ and be loyal. This is teaching there are a two different sides to the law. The wicked stand on the condemning side of the law. The apostle says that their relationship to the curse of the law is rebellion which is to curse Christ. But we are declared righteous because we have been justified in Christ. So the apostle pronounces a curse in extending it to the ends of the earth. This is why the apostle can pronounce his own preservation. Because the law pronounces death on all opposition. And the saints now enjoy a relationship with our Father who judges absolutely at all times. 

2 Tim 4 18 "The Lord will rescue me from every evil attack and will bring me safely to his heavenly kingdom. To him be glory for ever and ever. Amen." All scripture is given for our profit...may it be.