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Paul tried to explain . To reason that now being free of what had them bound up in guilt because of their inability to keep the Law, why go back to it. I think he worded it 'back to hanging on a tree'. Even today many Christians who believe in Jesus are being taught they are still bound to keep the 10 commandments. Why did Jesus have to suffer a that He did if we are to remain in the same pit of tortured mind? He freed us from it. Belief in Him is the ONLY righteousness which man can attain.Just as Jesus did NOT return to his existence in the OT neither should we. He ascended into Heaven and sits at the right hand of God.There were Christians in the earliest days of Christianity who believed in Jesus and yet still kept the Law, such as the Ebionites.