The conflict between good and evil has brought difficulties to many. Many because of it abandoned every belief, for, they thought, if there were the One Most Mighty God, the God to Whom we attribute all the good qualities, then there would be no room for evil in the world. There is no positive evil. We say that light is good and darkness is evil, that sight is good and blindness is evil, that peace is good and war is evil. But what brings us the rays of the sun, is light.
Darkness is simply lack of light.
Sometimes a seeming vice is simply misdirected virtue. There are people whose chief feature is avidity. They wish for more gold, more power, more glory. But avidity in its essence is the desire to have more than one already possesses. The question is only, in which direction this desire goes.