I've always been interested in obsessive, insane people.

The comic novels I did when I was in my 20s had a harder edge - less sympathy for people. Or a sympathy that was harder to detect: Characters' foibles and obsessive bents were unrelenting, like caricatures.

The history of saints is mainly the history of insane people.

am i insane" asked alice
"yes, but all the best people are" replied her father

...I see more pathology in others than I did ten years ago - the older I get, the more insane people seem...

Well, many insane people and seriously mentally ill people seem very reasonable.