Adam and Eve, who barely appear in the Bible after they are introduced in the book of Genesis, serve a short but important list of functions within early Christian writing. They represent Christ and Mary, respectively, among other typological readings of the Paradise narrative. They also stand for all of humanity, partly by virtue of their location at the top of the human genealogy, and partly because their acts in the garden are commonly universalized to represent the sins of each and all. The understanding of their sin as resulting in an original guilt passed on through the generations is by no means a common one in early Christian writing. The question of their historical existence is not foreign to some of the ancient authors—nor does it really preoccupy any of them—but it does not receive a straightforward or consistent answer.