A body can neither be known nor be without its parts, but to bring any part fully into act destroys it as a part. A stick with endpoints A and B is known by any multitude of parts – let AC be one of them. One actualizes this part by making a cut at C – but to do so makes AC no longer a part of a whole. A part thus has an intrinsic and essential repugnance to actuality, so far as its act is its annihilation as a part.
This nature of body allows a way to approach the logical whole by likeness and negation: for one actualizes a part by separating it from the whole by a difference, but to actualize such a part (say to actualize “animal” from the larger whole “living”) does not require making it no longer a real part of the greater whole: animals remain essentially living. By this separation, the logical whole enters into the part as a different sort of part- in the sense that “living” only partially accounts for what we find in animal.