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  There are essential truths about humans that have been engrained into our very biology, and therefore are our nature, because it is true for all humans. These truths include but are not limited to, the emphasis on acquisition of food, shelter and water, the tendency to form into a community and a search for property and ownership. This basic nature cannot be changed in any human being. However, one can play to human reason or emotion, and change behavior. Behavior, like which grocery store you frequent, what meat you eat or don't eat, or even how you cook your food, is malleable. So while agree with Revkin that you cannot change human nature, Revkin's definition of human nature is much more expansive and dips into what i consider flexible territory.