Nicene and Post-Nicene Fathers, Vol. II:
City of God: Chapter 6

Chapter 6.—Of the Evil of Death in General, Considered as the Separation of Soul and Body.

Wherefore, as regards bodily death, that is, the separation of the soul from the body, it is good unto none while it is being endured by those whom we say are in the article of death.  For the very violence with which body and soul are wrenched asunder, which in the living had been conjoined and closely intertwined, brings with it a harsh experience, jarring horridly on nature so long as it continues, till there comes a total loss of sensation, which arose from the very interpenetration of spirit and flesh.  And all this anguish is sometimes forestalled by one stroke of the body or sudden flitting of the soul, the swiftness of which prevents it from being felt.  But whatever that may be in the dying which with violently painful sensation robs of all sensation, yet, when it is piously and faithfully borne, it increases the merit of patience, but does not make the name of punishment inapplicable.  Death, proceeding by ordinary generation from the first man, is the punishment of all who are born of him, yet, if it be endured for righteousness’ sake, it becomes the p. 248 glory of those who are born again; and though death be the award of sin, it sometimes secures that nothing be awarded to sin.