Evil arises only when an entity goes astray into the delusions of separateness and materialism, and thence into conflict with other entities. There is no ultimate and eternal principle of evil, but there are forces of evil, unseen entities who have gone so far astray and are so powerful in themselves that they work against goodness, truth, and justice. But by their very nature such entities are doomed to eventual destruction, and even their work of opposition is utilized for good in the end and becomes the resistance against which evolution tests its own achievements, the grindstone against which it sharpens man's intelligence, the mirror in which it shows him his flaws.
-- Notebooks Category 11: The Negatives > Chapter 1: Their Nature > # 12
-- Perspectives > Chapter 11: The Negatives > # 4