Evil is not an entity. Mrs. Eddy writes: "Evil has no reality. It is neither person, place, nor thing, but is simply a belief, an illusion of material sense." Science and Health, p. 71.
Still, that doesn't mean that we don't directly confront and deny the claims of evil, or error, when seeking to eliminate them from our experience through Christian Science practice. What, then, are we talking to when we denounce error in healing sickness, sin, or death? What do we address? Are we talking to evil with a capital E?
Referring to the Biblical passage that tells of Christ Jesus' "casting out a devil, and it was dumb" (see Luke 11:14), Mrs. Eddy comments, "It could not have been a person that our great Master cast out of another person; therefore the devil herein referred to was an impersonal evil, or whatever worketh ill." Miscellaneous Writings, p. 190. Since evil has no entity or identity of its own except what we assign to it, it is impersonal, unreal, whether it claims to be sickness, sin, or death.