We are saved by grace, through faith,unto good works.
"Faith without works is dead." Ja 2:17
If His law is written in our hearts and minds (the New Covenant - Jer 31:31-34), then, it will be evidenced in our, daily, lives. We are to "walk as He walked." He walked in obedience, and by His Spirit, so, can we.
It is not by our might, nor power, but, by His Spirit, that, we walk with Him in holiness.
The law continues to play a part in our lives - it calls us to repentance, and dependence upon the Spirit of Grace. That is what sanctification is all about.