  Further, the soul, as the end of the compound organism, is also the final cause of the body. Minimally, this is to be understood as the view that any given body is the body that it is because it is organized around a function which serves to unify the entire organism. In this sense, the body’s unity derives from the fact it has a single end, or single life directionality, a state of affairs that Aristotle captures by characterizing the body as the sort of matter which is organic (organikon; DA 412a28). By this he means that the body serves as a tool for implementing the characteristic life activities of the kind to which the organism belongs (organon = tool in Greek).  Taking all this together, Aristotle offers the view that the soul is the ‘first actuality of a natural organic body’ (DA 412b5–6), that it is a ‘substance as form of a natural body which has life in potentiality’ (DA  412a20–1) and, again, that it ‘is a first actuality of a natural body which has life in potentiality’ (DA  412a27–8).