Augustine continues the discussion of this point, noting that these same people interpret Genesis 2:17 in a questionable fashion. The passage reads, "From that tree you shall not eat; the moment you eat from it you are surely doomed to die,’’ and is interpreted by these people to refer to the death of the soul, rather than the death of the body. Augustine refutes this position by turning to Genesis 3:19, which reads, "you are dirt, and to dirt you shall return,’’ to show that death is distinctly post-lapsarian (Ibid.; Fathers of the Church). For this reason, Augustine writes that "if Adam had not sinned, he would not have been divested of his body, but would have been clothed upon with immortality and incorruption’’ (Ibid.; Fathers of the Church).
But does this make Adam immortal by nature? Augustine’s answer is a decisive no. He points out the difference between being mortal, or capable of dying, and being destined to die. He does this by analogy, noting that "our body in its present state can…be capable of sickness, although not destined to be sick’’ (Ibid. I.5; Fathers of the Church). In the same way, Adam was capable of dying, as he did after the fall, but was not destined to do so as humans now are. Had Adam not sinned, he would have grown "full of years without decrepitude, and, whenever God pleased, pass from mortality to immortality without the medium of death’’ (Ibid. I.4; Fathers of the Church). According to Augustine, mortality was part of the state of original justice, but this mortality would have become immortality had Adam refrained from sin. So man was mortal, but he did not have to die.