If we are law keepers we are interested in our own righteousness and in the keeping of the law we deem ourselves righteous as do other law keepers. The law becomes the measuring stick to determine our spirituality. This is confirmed in Philippians 3:9 which reads: And be found in him, not having “MINE OWN RIGHTEOUSNESS,” “WHICH IS OF THE LAW,” but that which is through the faith of Christ, the righteousness which is of God by faith.
If we are law keepers, we are self righteous and unable to know Christ relationally for verse 10 reads, that I may know Him, and the power of His resurrection, and the fellowship of His sufferings, being made conformable unto His death. Therefore, as law keepers we cannot know Christ because we are self righteous which renders us unable to conform unto His death which is a requirement for knowing Christ.
Living by the law negates living by grace because it diminishes the finished work of Christ and renders it unfinished! Grace plus the law is not grace, for grace to be grace it must stand alone! Grace provides the power to uphold the law because grace exists in love.