Law and Grace

Luther said: "We read Moses not because he applies to us, that we must obey him, but because he agrees with the natural law and is conceived better than the Gentiles would ever have been able to do. Thus the Ten Commandments are a mirror of our life, in which we can see wherein we are lacking, etc

By following Christ and obeying Christ we are exceeding the requirements of the laws of Moses because Christ is greater than Moses.

Galatians 5:18 -> Romans 6:14,15 (KJV)
14 For sin shall not have dominion over you: for ye are not under the law, but under grace. 15 What then? shall we sin, because we are not under the law, but under grace? God forbid.