A doctrine such as this is set before us by Moses under the disguise of an historical manner. And yet this disguise of history contains a teaching which is most plain. For after, as he tells us, the earliest of mankind were brought into contact with what was forbidden, and thereby were stripped naked of that primal blessed condition, the Lord clothed these, His first-formed creatures, with coats of skins. In my opinion we are not bound to take these skins in their literal meaning. For to what sort of slain and flayed animals did this clothing devised for these humanities belong? But since all skin, after it is separated from the animal, is dead, I am certainly of opinion that He Who is the healer of our sinfulness, of His foresight invested man subsequently with that capacity of dying which had been the special attribute of the brute creation. Not that it was to last for ever; for a coat is something external put on us, lending itself to the body for a time, but not indigenous to its nature. This liability to death, then, taken from the brute creation, was, provisionally, made to envelope the nature created for immortality. It enwrapped it externally, but not internally. It grasped the sentient part of man; but laid no hold upon the Divine image. This sentient part, however, does not disappear, but is dissolved. Disappearance is the passing away into non-existence, but dissolution is the dispersion again into those constituent elements of the world of which it was composed. But that which is contained in them perishes not, though it escapes the cognisance of our senses.
The reference, of course, is to Genesis 3:21: "The LORD God made garments of skin for Adam and his wife and clothed them."