When we even flirt with the idea that Christ could disobey God we deconstruct the Trinity into meaninglessness.
The Godhead is three persons in "one substance, power and eternity." That essence is the same and always in accord with itself and is eternally self-authenticating. God cannot contradict Himself. God is not divided against Himself.
"[God] cannot deny himself" -- 2 Timothy 2:13
"God...cannot lie." -- Titus 1:2"No lie is of the truth." -- John 2:21
WESTMINSTER CONFESSION OF FAITH: "In the unity of the Godhead there be three Persons of one substance, power, and eternity: God the Father, God the Son, and God the Holy Ghost. The Father is of none, neither begotten nor proceeding; the Son is eternally begotten of the Father; the Holy Ghost eternally proceeding from the Father and the Son."
So Christ's humanity is part of the eternal Trinity? The man Jesus is part of Trinity? His humanity is co-eternal with divinity of the Trinue God? Is his humanity also homoousious, of one essence (divine), as that of the three divine Hypostases?
I think it is you who is deconstructing the Holy Trinity.
The Godhead is three persons in "one substance, power and eternity."
I repeat: Christ's humanity is not of ne essence with the the three Hypostases, but a separate essence proper only to the Son and not to the Father or the Spirit. It is also not co-eternal. There was a time when Jesus did not exist in human nature. Incarnation is an event that occurred in time.
That essence is the same and always in accord with itself and is eternally self-authenticating
Christ is not only of one essence with the Father. He is also human. But then Protestants may have their own "formula."
God cannot contradict Himself. God is not divided against Himself
Christ possessed both human will and human soul. He had all the potential for fall that we have, as is proper to human nature, or else he couldn't have been fully human. His humanity would have been only a pretense. That is a heresy.
If he had no potential for fall, then his resisting tempations is a charade.
The Father is of none, neither begotten nor proceeding; the Son is eternally begotten of the Father; the Holy Ghost eternally proceeding from the Father and the Son."
Aside from the heresy of double origin which I took the liberty to strike out, what's that got to do with Christ's humanity?