He was experimenting with being ardently sympathetic with everybody he met. He thought that might make the world a slightly more pleasant place to live in. He called Billy's mother 'dear' He was experimenting with calling everybody dear.

“Until you die .. it's all life.”

“Is this some kind of joke?""That's for me to know and you to find out.""Maybe y…”

“I think that scientific persons of the future will scoff at scientific persons …”

“Screw you, Jasper,” said Castle mildly, “and screw Mother’s Day and Christmas, …”