G00d and Evil

 Ramchal (Ikkarim 03) However the truth of the existence of good and evil is that the Master placed holiness and impurity into the world. The explanation of holiness is the existence of closeness to Him and that of impurity is the existence of distance from Him. Holiness is the impact that the Master effects upon someone who is fitting for it and the influence that descends upon him. And impurity is the distancing that the Holy One, distances Himself, and the absence that He so produces. However the truth is that the Master created various spiritual powers for this purpose. And darkness and pollution are effected by them, such that in every place that you find this pollution, He will remove His holiness from there and remove His light from there, may He be blessed. And these are called the powers of impurity (kochot hatumah).