Spirit and the Law
God saves us and puts us back in the world, now with His Spirit, we are able to follow and obey Him, through the spirit. Without the spirit no can see or understand the things from above, with the Spirit of God we are enabled to do so.
The Jews observed the laws because in them they thought they were righteous, with us Christ is out righteousness, He gives us the spirit to allow us to follow and obey him and sanctify us and conform us to the image of Christ.
Conformity to the image of Christ
Jesus was sinless, therefore conformity to the image of Christ is partially becoming dead to sin, or restraining sin in our lives, through the power of the Spirit, which to me means obeying God, because disobeying God is sin.
Becoming a living sacrifice would also mean focusing more on Christ and less on ourselfs, but this also must mean we consecrated ourselfs to Christ, again there can not be hidden sin in our lives if we are consecrated unto God.
I would say another aspect is loving God and others.
I will leave with this quote from the Lord:
If you keep my commandments, you will abide in my love, just as I have kept my Father’s commandments and abide in his love. John 15:10