Evil

Opposite of good, physically and morally. Its origin, presence, and prevalence, in the forms of disease, suffering, and sin, have always perplexed earnest minds, and still present an insoluble problem, despite countle efforts to explain them. The Gnostics and their succe ors held the theory of dualism. Others hold that evil is nece ary as a foil to good, and implied by free will.