Likewise, also, propositions
contradicting the contraries of general opinions will pass as
general opinions: for if it be a general opinion that one ought to
do good to one's friends, it will also be a general opinion that one
ought not to do them harm. Here, that one ought to do harm to one's
friends is contrary to the general view, and that one ought not to
do them harm is the contradictory of that contrary. Likewise also,
if one ought to do good to one's friends, one ought not to do good
to one's enemies: this too is the contradictory of the view contrary
to the general view; the contrary being that one ought to do good to
one's enemies. Likewise, also, in other cases. Also, on comparison, it
will look like a general opinion that the contrary predicate belongs
to the contrary subject: e.g. if one ought to do good to one's
friends, one ought also to do evil to one's enemies. it might appear
also as if doing good to one's friends were a contrary to doing evil
to one's enemies: but whether this is or is not so in reality as
well will be stated in the course of the discussion upon contraries.
Clearly also, all opinions that are in accordance with the arts are
dialectical propositions; for people are likely to assent to the views
held by those who have made a study of these things, e.
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