2. If wickedness was the province of a special being who is called Satan, he must be either equal to God, and for all eternity as powerful, or he must be his inferior.
In the first case, there would be two rival powers in constant contention, each one seeking to overthrow the work of the other, and constantly thwarting each other. This hypothesis is irreconcilable with that unity of purpose which reveals itself in the arrangement of the Universe.
In the second case this being, being inferior to God, would be subordinate to him. Not being able to exist for all eternity like him, without being his equal, he would have had a commencement. If he has been created, God must have been his creator. Thus God would have created a bad spirit, which is impossible if he be infinite goodness. (See “Heaven and Hell” chap. X, “The Demons”)