@Don Reto Nay you say: Christ has the fullness of the sanctifying grace because he is God.
Sir,without judging you. But when I read things like that, it sounds like a construct that is put in place to explain things that are not understood, leading to false conclusions and hence stray others.
My Jesus is the God who came down from the heavens and became a man among men with all sores that being a man implies, even subject to the temptations of the adversary and by virtue he became the Son of God, and by His own decision he was crucified to fulfill the will of God the father. (He could walk away from it and He did not). All because of the fulfillment of divine justice.
Because one day the devil was going to and fro in the land, and walking up and down on it and after his journeys he turned himself to God and said: Yeah God, you have an easy life there yo. Angels that serve you all day in your precious heaven and you see everything and everyone from above and you are judging the people down there. Hey I can do that in your position, you don't even know how it is to be down there, live in poverty, suffering hunger, being repressed by kings landlords and my bullies and despised by everyone.
I pray thee God, if you were in that situation having nothing and in need you would quickly sin as they sin. You would steal the bread when truly hungry, you would kill when attacked, and you would curse God when sick or repressed.
And while the words of the devil were righteous, God went down and became men, having nothing and needing, just like everybody else. Out of righteousness.
So once a man appears in front of Jesus Christ the judge, He is judged righteously.
So you were a thief and a murderer? Jesus asks the man on trial. Yes answers the man, if you were in my situation, you would have stolen and murdered yourself.
Jesus the Judge answers: I was in your situation, I had nothing, I was despised and rejected by my own people, they tortured me and killed me, even so I did not open my mouth, and you knew that this was what I did, because this testimonial is well known in the whole world.
Righteousness my dear. Christ has the fullness of the sanctifying grace not because of being God (sounds muslim to me), but because of virtue. He earned it.