" I have argued that when we encounter other humans we experience them first as persons, and cannot help but do so. This means that in order to see a human person as an animal or organism we must abstract from the totality of our experience. My suggestion is that we take this fact seriously in understanding the ontology of everyday objects. According to this proposal a “human animal” or “human organism” is not a thing in its own right, but rather a particular perspective we take on ourselves and our lives, one that attends only to our purely biological functions. "

― , Staying Alive: Personal Identity, Practical Concerns, and the Unity of a Life