What is the meaning of the story of the clean house inhabited by seven evil spirits?

Please explain Matthew 12:43-45, and Luke 11:24-26; also why does Mr. Newberry insert the word, “it”, in his margin for the word, “he”, in Luke 11:24?

Mathew 12:43-45  When the unclean spirit is gone out of a man, he walketh through dry places, seeking rest, and findeth none.  (44)  Then he saith, I will return into my house from whence I came out; and when he is come, he findeth it empty, swept, and garnished.  (45)  Then goeth he, and taketh with himself seven other spirits more wicked than himself, and they enter in and dwell there: and the last state of that man is worse than the first. Even so shall it be also unto this wicked generation.

Luke 11:24-26  When the unclean spirit is gone out of a man, he walketh through dry places, seeking rest; and finding none, he saith, I will return unto my house whence I came out.  (25)  And when he cometh, he findeth it swept and garnished.  (26)  Then goeth he, and taketh to him seven other spirits more wicked than himself; and they enter in, and dwell there: and the last state of that man is worse than the first.
 

There are certain important words in this section which, if understood, will enable us to grasp the general meaning of the passage.
The “house” refers, I believe, to the house of Israel. “Generation” refers to the class of people then living, a people hostile to the Lord Jesus. The unclean spirit is, I believe, the spirit of idolatry which once found a resting place in Israel, but of which Israel were cured as the result of their Babylonian captivity. That idolatrous spirit will find no resting place save in apostate Israel, to which house it will later return, leading them to worship a mere man—the Man of Sin—the worst form of idolatry. This will bring upon them a far more severe judgment than ever hitherto they have known and so their last end will be worse than the first.
What has been effected by Christ Who came to that house is that he swept and garnished it, turning out from it things that hitherto occupied it. The spirit of idolatry in full force (with seven other spirits) will return to that house with, as I have said, disastrous consequences. The “generation” will persist until the end. They would not have Him Who came in His Father’s Name: another shall come in his own name and him theywill receive.

W.R.