" In this primal sense, then, evil is evil because it is rebellion against God. Evil is the failure to do what God demands or the performance of what God forbids. Not to love God with heart and soul and mind and strength is a great evil, for God has demanded it; not to love our neighbor as ourself is a great evil, for the same reason. To covet someone’s house or car or wife is a great evil, for God has forbidden covetousness; to nurture bitterness and self-pity is evil, for a similar reason. The dimensions of evil are thus established by the dimensions of God; the ugliness of evil is established by the beauty of God; the filth of evil is established by the purity of God; the selfishness of evil is established by the love of God. "
― D.A. Carson , How Long, O Lord?: Reflections on Suffering and Evil