But according to the Scriptures we have been taught that death is threefold. One death is when we die to sin, but live to God. Blessed, then, is that death which, escaping from sin, and devoted to God, separates us from what is mortal and consecrates us to Him Who is immortal. Another death is the departure from this life, as the patriareh Abraham died, and the patriarch David, and were buried with their fathers; when the soul is set free from the bonds of the body. The third death is that of which it is said: “Leave the dead to bury their own dead.” In that death not only the flesh but also the soul dies, for “the soul that sinneth, it shall die.” For it dies to the Lord, through the weakness not of nature but of guilt. But this death is not the discharge from this life, but a fall through error.

Spiritual death, then, is one thing, natural death another, a third the death of punishment. But that which is natural is not also penal, for the Lord did not inflict death as a penalty, but as a remedy. And to Adam when he sinned, one thing was appointed as a penalty, another for a remedy, when it was said: “Because thou hast hearkened unto the voice of thy wife, and hast eaten of the tree of which I had commanded thee that of it alone thou shouldst not eat, cursed is the ground in thy labor; in sorrow shalt thou eat its fruit all the days of thy life. Thorns and thistles shall it bring forth to thee, and thou shalt eat the herb of the field. In the sweat of thy face shalt thou eat thy bread, till thou return to the earth from which thou wast taken.”

Here you have the days of rest from penalties, for they contain the punishment decreed against the thorns of tiffs life, the cares of the world, and the pleasures of riches which shut out the Word. Death is given for a remedy, because it is the end of evils. For God said not, “Because thou hast hearkened to the voice of the woman thou shalt return to the earth,” for this would have been a penal sentence, as this one is, “The earth under curse shall bring forth thorns and thistles to thee;” but He said: “In sweat shall thou eat thy bread until thou return to the earth.” You see that death is rather the goal of our penalties, by which an end is put to the course of this life. — Two Books on the Decease of His Brother Saytrus – Book II, para. 36-38.