How do philosophers decide where to draw a distinction between what one "has"

How do philosophers decide where to draw a distinction between what one "has"

How do philosophers decide where to draw a distinction between what one "has" and what one "is". That is to say, am I the same "I" that existed before I lost a toe, or a leg, or the rest of my body, or even my brain, my mind, my thoughts, my self? Is it not logical to say that what is "me" must be distinct from what is "mine"? If this is not true, then would not "I" exist only in a virtual sense, as the image or focus of all "my" possessions?

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