Family Circus: It must be hard work being a saint. You hafta pose for a lot of windows.

What Billy means is that it's hard to be saint because of the way you're constantly having to live up to other people's expectations, their perfected image of you, the image they reproduce in windows and paintings and books.

Thel, of course, has no idea what the fuck Billy's talking about; it's especially hard being a saint when you're surrounded by people as stupid as the Keanes.