Kindness.

Kindness is one of the main themes of Sir Thursday. Unlike most of the Denizens in the House, Arthur is a polite young man who is concerned about the different dimensions of the Architect. He doesn't consider himself better than others like Dame Primus does.

In fact, his kindness is displayed in stark contrast to her snobbery at different times in the book. Most notably when she refuses to acknowledge Leaf's existence in the beginning of the book. It is also shown when she refuses to help Leaf after she has been infected by Skinless Boy's mold. Arthur doesn't appreciate the way Primus treats his friend and makes a point to show Primus that he isn't happy. Toward the end of the book, Arthur calls for Dame Primus and excites the operator on the other end of the line by using the world "please.

Arthur is tempted to...