When something becomes an obsession?

A man who has the habit of anger even of fault-finding is certain to be surrounded by antagonistic spirits.

I have seen a score of them around a man, thrilling him with their own malignant magnetism, stirring him up again, when by reaction, he would have cooled down.

Sometimes, the impersonal interest in mere strife becomes personal—an angry spirit here may find that by attaching himself to a certain man he is sure to get every day a thrill or thrills of angry excitement as his victim continually loses his temper and storms and rages.

This is one of the most terrible misfortunes, which can happen to anybody.

Carried to its ultimate, it may become obsession and end in insanity. The same law applies to other unlovely passions—those of lust and avarice.