Your body—this very body—is eternal. It was never born and it never dies; it never ages, never becomes ill, diseased, injured; it never degenerates or becomes dysfunctional. It is spirit not matter. Only matter (which is belief) is born, grows, matures, and then becomes ill, diseased, decrepit, and eventually dead.
Do you catch it? Only belief is, and expresses, these false qualities. And only a believer can experience them.
From Chapter 11, What Is Consciousness?
Healing of the Body page 138