" Above all, disagreement is needed to stimulate the imagination. One may not need imagination to find the one right solution to a problem. But then this is of value only in mathematics. In all matters of true uncertainty such as the executive deals with—whether his sphere be political, economic, social, or military—one needs creative solutions which create a new situation. And this means that one needs imagination—a new and different way of perceiving and understanding. "

― Peter F. Drucker , Management: Tasks, Responsibilities, Practices