Book 4
19
Dialecticians and sophists wear the same appearance as the philosopher, for sophistry is Wisdom in appearance only, and dialecticians discuss all subjects, and Being is a subject common to them all; but clearly they discuss these concepts because they appertain to philosophy.
20
For sophistry and dialectic are concerned with the same class of subjects as philosophy, but philosophy differs from the former in the nature of its capability and from the latter in its outlook on life. Dialectic treats as an exercise what philosophy tries to understand, and sophistry seems to be philosophy; but is not.
21
Further, the second column of contraries is privative, and everything is reducible to Being and Not being, and Unity and Plurality; e.g. Rest falls under Unity and Motion under Plurality. And nearly everyone agrees that substance and existing things are composed of contraries; at any rate all speak of the first principles as contraries—
22
some as Odd and Even,The Pythagoreans. some as Hot and Cold,Perhaps Parmenides. some as Limit and Unlimited,The Platonists. some as Love and Strife.Empedocles. And it is apparent that all other things also are reducible to Unity and Plurality (we may assume this reduction); and the principles adduced by other thinkers fall entirely under these as genera.
