a writer's 'ability' [='capability', 'capacity'] 'to interest' readers
He always works 'to the best of his ability'. [=as well as he can]
Does he have the 'ability' [='authority'] 'to fire' employees?
(..) I can't stay here and be a part of this. FATHER: Don't you think there will be questions? MOTHER: Questions? FATHER: Well, now, what does it say about my ability to carry out my work if I cannot control my own family? MOTHER: Work? Is that what you call it? FATHER: Pull yourself together, woman. (..)2008 The Boy in the Striped Pajamas