Romans 7:5-6

Romans 7:5-6 For when we were in the realm of the flesh, the sinful passions aroused by the law were at work in us, so that we bore fruit for death.  But now, by dying to what once bound us, we have been released from the law so that we serve in the new way of the Spirit, and not in the old way of the written code.
 
In this passage Paul is speaking as a Jew under Old Covenant Law.  Before a sinner is redeemed his sinful passions bring forth the fruit of death.  Being captive to sin he is drawn to sin and his sinful passions are actually aroused by the Law of Moses.  Therefore, the law makes sin worse rather than restraining it.

The Law of Moses given at Mt. Sinai was the covenant contract for the nation of Israel.  They were bound by this covenant to obey the law in order to be blessed and failure brought about curses.  But now by dying to that law through faith in Christ, Jewish believers were released from the law in order to serve in the new way of the Spirit rather than the old way of the written code.  This means that Jewish and Gentile believers are new creations in Christ and have the indwelling Holy Spirit to lead them in righteousness through the internal motivation from the laws that are written on their heart [Hebrews 8:10].  The Holy Spirit replaced the tablets of stone [Law] for both Jews and Gentiles and they know the Lord and have their sins forgiven [Heb. 8:11-12].  Praise God that the curses of the Law have been removed for all who have faith in Jesus Christ. 

While Old Covenant members served through the Law, New Covenant members serve through the indwelling Holy Spirit.