In the lines provided, Achebe uses a statement about custom—"In Umuaro it is not our custom to refuse a call, although we may refuse to do what the caller asks"—to convey a deeper meaning. This is the essence of a proverb; it expresses wisdom or cultural norms. The proverb is extended through the reference to Ezeulu's actions, showing how he adheres to the custom but also manipulates it to avoid confrontation. Traditional parables are longer stories that teach a moral lesson.