37 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 you have hearkened unto the voice of your wife, and hast eaten of the tree of which I had commanded you that of it alone you should not eat, cursed is the ground in your labor; in sorrow shall you eat its fruit all the days of your life. Thorns and thistles shall it bring forth to you, and you shall eat the herb of the field. In the sweat of your face shall you eat your bread, till thou return to the earth from which you were taken.”
Source: On the Death of Satyrus (New Advent)