"God alone is absolute. Evil, which has no original essence but is merely the resistance of the free creature to Him that is before all ages -- to God -- cannot be absolute. Therefore evil in the literal sense does not, and cannot, exist. All evil effected by free beings must live like a parasite on the body of the good. Evil is bound to find a justification for itself, must appear disguised as good -- often the highest good. Evil always and inevitably contains an element appearing to have a positive value, and it is this which seduces man. Evil strives to present its positive aspect as a jewel so precious that all means are justified to attain it."
(Archimandrite Sophrony (Sakhorov), St. Silouan the Athonite, St. John the Baptist, Essex, p. 117)