We are no longer a slave of sin. We were made free, as a servant is who is set at liberty. And who is, therefore, no longer under obligation to obey. We became voluntarily under the dominion of righteousness. Now you are set free from sin and are slaves who please God.
We Christians are indeed under the law as other men, but it is the new law, the law of the Spirit of Christ. We are under grace. That law which to nature is a grievous bondage, is to those who live under the power of God's presence, what it was meant to be, a rejoicing. Let us go to Him for grace. Let us seek His face.