en_tn_condensed/rom/07/23.md

a different law

These words refer to the natural human desire to rebel against God and disobey him. Paul calls this a law because he has observed that this is the way people live. It is not a collection of written commands.

in the members of my body

"in my actions" or "in my behviors"

that new law in my mind

These words refer to the law of Moses, which was God's commands in written form.