28. We have demonstrated that acting and experiencing were movements;
that, among the movements, some are absolute, while others constitute
actions or passions.[431]
We have also demonstrated that the other things that are called genera
must be reduced to the genera we have set forth.[432]
We have also studied relation, defining it as a habit, a "manner of
being" of one thing in respect of another, which results from the
co-operation of two things; we have explained that, when a habit of
being constitutes a reference, this thing is something relative, not
so much as it is being, but as far as it is a part of this being, as
are the hand, the head, the cause, the principle, or the element.[433]
The relatives might be divided according to the scheme of the ancient
(philosophers), by saying that some of them are efficient causes, while
others are measures, that the former distinguish themselves by their
resemblances and differences, while the latter consist in excess or in
lack.
Such are our views about the (categories, or) genera (of existence).