"Leaders are active instead of reactive, shaping ideas instead of responding to them. Leaders adopt a personal and active attitude toward goals. The influence a leader exerts in altering moods, evoking images and expectations, and in establishing specific desires and objectives determines the direction an organization takes. The net result of this influence is to change the way people think about what is desirable, possible, and necessary. In other words, leaders are visionaries and managers operate within those established visions."

-- Abraham Zaleznik

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