we are only made of air and dust

"Yes, you are nosy," said Howl. "You're a dreadfully nosy, horribly bossy, appallingly clean old woman. Control yourself. You're victimizing us all."

"But it's a pigsty," said Sophie.
"I can't help what I am!"

"Yes you can," said Howl. "And I like my room the way it is. You must admit I have a right to live in a pigsty if I want. Now go downstairs and think of something else to do. Please. I hate quarreling with people."