Old Testament Law is death. The law killed Jesus Christ. People who could quote scripture and lived blameless in the law killed the Word — made flesh (John 1:14). Even Paul, the Pharisee of Pharisee, had to die unto himself to escape a life lived perfectly in the law. The law had to die in him for the spirit to fill him with the love of the new, better and perfect covenant. Paul tells us (Philippians 3:8) For his sake I have suffered the loss of all things and count them as rubbish, in order that I may gain Christ. Paul is saying that his life, perfect in the law of the Old Testament, was worthless (as dung), in comparison to knowing Christ and living in His spirit. Without the law, sin is dead. (Romans 7:8) apart from the law, sin lies dead. Sin is made alive in the law but cannot exist in love!
(Romans 7:5-6) For while we were living in the flesh, our sinful passions, aroused by the law, were at work in our members to bear fruit for death. But now we are released from the law, having died to that which held us captive, so that we serve in the new way of the Spirit and not in the old way of the written code.
(Romans 7:7) if it had not been for the law, I would not have known sin –Apostle Paul