If Satan also be divided against himself, how shall his kingdom stand? because ye say that I cast out devils through Beelzebub. Throughout this argument Jesus assumes the existence of a kingdom of evil, all armed and thoroughly organized to carry out its dread purposes.
He concedes, too, in language which admits of no questioning, the existence of a chief of this evil confederacy. Throughout his reply, the Master, while carefully bearing in mind the ability and skill of his enemies who had suggested this questioning to the people, addresses himself to the common sense of the mixed multitude who were present on this occasion.
The argument is perfectly simple. It is not thinkable that the prince of evil would fight against himself, which he would be doing if he put such mighty weapons into Jesus' hands.