Of all the things which exist some are such that they cannot be predicated of anything else truly and universally, eg Cleon and Callias, ie the individual and sensible, but other things may be predicated of them (for each of these is both man and animal); and some things are themselves predicated of others, but nothing prior is predicated of them; and some are predicated of others, and yet others of them, eg man of Callias and animal of man.