Let me begin by briefly summarizing the history of the seven deadly sins in the church and then go on to illustrate Lewis' knowledge of them by referring to several non-Narnian works. The development of a list of seven especially damning sins is shadowy. Early church father (Hermas, Tertullian, Augustine), while never actually listing specific "deadly" sins did suggest some sins were worse than others, perhaps with 1 John 5:16-17 in mind: "If anyone sees his brother committing a sin not leading to death, he shall ask and God will for him give life to those who commit sin not leading to death. There is a sin leading to death; I do not say that he should make request for this. All unrighteousness is sin, and there is a sin not leading to death." What eventually resulted, therefore, were numerous lists of especially harmful sins. However, the list that came to be most influential in the church was the one developed by Gregory the Great (540-605) characterized by its Latin acronym, saligia: superbia (pride), avaritia (greed), luxuria (luxury, later lust), invidia (envy), gula (gluttony), ira (anger), and acedia (sloth).