Chapter 13 — Part I: The Creed — Article XI: The Resurrection of the Body
Section 4. Although in Sacred Scripture the word flesh often signifies the whole man, as in Isaias, All flesh is grass, and in St. John, The Word was made flesh; yet in this place it is used to express the body only, thus giving us to understand that of the two constituent parts of man, soul and body, one only, that is, the body, is corrupted and returns to its original dust, while the soul remains incorrupt and immortal. As then, a man cannot be said to return to life unless he has previously died, so the soul could not with propriety be said to rise again.