Saint Anselm

“ And when the question is asked whether the same God-man could preserve his life, so as never to die, we must not doubt that he always had the power to preserve his life, though he could not wish to do so for the purpose of escaping death. And since this disposition, which forever prevents him from wishing this, arises from himself, he lays down his life not of necessity, but of free authority. ”

“ If, then, as you say, he could not avoid death because he was certainly to die, and was on this account certainly to die because it was his free and unchangeable desire, it is clear that his inability to avoid death is nothing else but his fixed choice to die. ”

“ But we see, on the other hand, that what God unchangeably wishes cannot avoid being so, but takes place of necessity. Wherefore, if God wished that man to die, he could but die.
Anselm. Because the Son of God took the nature of man with this desire, viz., that he should suffer death, you prove it necessary that this man should not be able to avoid death. ”