The mind can set itself aside from and examine the body that houses it, the presumed "soul" contained somewhere within it, or indeed any other manifestation of self that the mind cares to focus on. Company seems to ask: "what is the locus of the self and how should a person proceed in relation to that amorphous and dynamic entity?" This relates to Plato's paradox of the third man argument - in which a third self (and then another, and another ad infinitum) is required to explain how a man and the form of man are both man, and so on.
The mind can separate itself from and examine the body that houses it, as well as any other manifestation of self that the mind chooses. Company wonders: "where does the self reside, and what should one do in relation to this ambiguous and ever-changing entity?" This parallels Plato's paradox about the third man - where a third self (and so on) is required to explain how a human being and the concept of humanity are both humans.