For your obedience is come abroad unto all men. I am glad therefore on your behalf: but yet I would have you wise unto that which is good, and simple concerning evil. Romans 16:19
The believer is not subject to the law for justification or for sanctification. Being united with Christ by faith, he is one with Christ who kept the law, both in its precepts and penalty, that the believer might be made free, Galatians 3:11-14. Does this mean then that being free from the curse and condemnation of the law, the believer has no interest in obeying the lawgiver and law keeper? God forbid!
Where there is true, saving faith, there is obedience to Christ, who is the object of that faith. There is wisdom pertaining to what is true doctrinally and in conduct. We are to stand fast in the liberty wherewith Christ has made us free, not subjecting ourselves to any form of legalistic works or fleshly motivation in serving God, and yet, we are to serve Him, spirit, soul, and body, 1 Cor. 6:19,20.
A true believer's obedience is not one of duty or obligation, but wholly founded upon the Gospel principle of grace in Christ Jesus. Where the grace of God reigns, it renders the sinner obedient to Christ and His glory in all things, Romans 5:20,21. It is grace that reigns through righteousness, not our own, but the imputed and imparted righteousness of Christ. As one writer aptly stated, the believer "obeys, but it is all in faith. He works, but it is from a sense of the Father's love to him in His Son. Gratitude taught by the Holy Spirit influences his heart and life. His heart has the love of God written upon it, and his life manifests it. He serves God with a thankful mind, and without fear, and cheerfully does all the good he can to man for Christ's sake."