All the goodness of God wrought through Christ's death cannot take effect if one chooses to be under the law. That is not anybody wants! And no body wants to fall from grace!
Galatians 5 :1-4
Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage.2 Behold, I Paul say unto you, that if ye be circumcised, Christ shall profit you nothing.
3 For I testify again to every man that is circumcised, that he is a debtor to do the whole law.
4 Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.