Who only has immortality, dwelling in the light which no man can approach unto; whom no man has seen, nor can see: to whom be honor and power everlasting. Amen.
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Augustine of Hippo
AD 430
So if God alone has immortality, is the soul mortal? That’s why I said the soul is immortal after its own fashion. You see, it can also die. Your graces must try to understand, and then the problem will be solved. I make bold to say, the soul can die, can be killed. Certainly it’s immortal. So there you are; I make bold to say it is both immortal in one sense and capable of being killed in another sense. And that’s why I said there is a kind of immortality, that is to say, an absolute and total unchangeableness, which God alone has, as it says of him, “Who alone has immortality.”