Recognizing that justification does not come by the works of the law, a believer ought not to frustrate God's grace. By grace through faith in Christ's work on Calvary's cross, we've been crucified with Christ so that we can have life in Him. Christ has given us everything freely by His grace. Why would a believer frustrate our complete position in Christ by adding the bondage of the law to our lives in Christ and grieve the Holy Spirit of God?