(~180AD) Since his “Demonstration” is not an apologetic work, but rather an exposition of Christian doctrine, Irenaeus spends much less time dealing with opposing doctrines here than he does in “Against Heresies”. It comes as no surprise, then, that Irenaeus does not here address the issue of reincarnation directly; but even though he does not handle it directly, he does make statements that demonstrate a viewpoint that is in harmony with that displayed in his earlier work.

In both works Irenaeus expresses his belief in the unity of the body and soul, in terms of both the composition, and the responsibility of the complete man. Just as man exists as body and soul united, so must he be pure in both if he is to have hope in the life to come. This is an argument commonly used by Irenaeus (cf. comments on “Against Heresies”) as will be seen in the quote below, and in the fragments that follow.