If we are indeed new creatures in Christ then we must conclude that the new creature or species has a nature that is different than the old creature or species.
I propose that the commandment to love and the nature to love are synonymous. Just as when God created light, He spoke it into being and that speaking contained the laws which govern the nature of light.
The OT prophesied of a time when the laws would be written on our hearts or we could say, the very nature of our being.
This becomes easy to see if we simply substitute the word ‘nature’ for the word ‘law’ in all of Romans 8.
I’m sure I am not expounding on this as clearly as I have it in my heart, so I will attempt to give an illustration:
A duck doesn’t obey a written set of laws from the “ducks for dummies” book to know to fly south in the winter. He just knows to do so because of the law written in his heart or his nature.
The dilemma a new creation in Christ finds himself in is that he has a mind which was trained by the old creation.
Walking in the spirit is about yielding to the change taking place in your heart and being willing to forgo what your head has to say whenever it contradicts.
It is religion which says that God forgives us but can’t change us.
Christianity is about God changing us because He has already forgiven us.
“Father forgive them for they know not what they do,” is a prayer that got answered.