Angels are purely spirit beings. They stand for the purely good aspect in existence while Satan and his descendants represent the purely evil aspect. God is One and Infinite. He does not have an opposite. Other than God all beings and existents each have an opposite. Since man has two opposite aspects in his nature on inclined to good the other to evils angels represent this good aspect while Satan or Satans his evil one. Angels invite him to his purely spiritual or ‘angelic’ aspect while Satan tries to seduce him by calling him to do evil. This struggle between good and evil in man and in the universe as a whole has been continuing since the beginning of existence. Everyone feels a stimulus calling him to good and evil at the same time. The stimulus calling him to good comes from angels or his unpolluted spirit; the stimulus inviting him to evil comes from Satan collaborating with his carnal self which represents his animal aspect.