what we opine? or is the subject-matter of opinion the
same as the subject-matter of knowledge?

Nay, he replied, that has been already disproven; if difference in
faculty implies difference in the sphere or subject matter, and if, as
we were saying, opinion and knowledge are distinct faculties, then the
sphere of knowledge and of opinion cannot be the same.

Then if being is the subject-matter of knowledge, something else must
be the subject-matter of opinion?

Yes, something else.

Well then, is not-being the subject-matter of opinion? or, rather, how
can there be an opinion at all about not-being? Reflect: when a man has
an opinion, has he not an opinion about something? Can he have an
opinion which is an opinion about nothing?

Impossible.

He who has an opinion has an opinion about some one thing?

Yes.

And not-being is not one thing but, properly speaking, nothing?

True.

Of not-being, ignorance was assumed to be the necessary correlative; of
being, knowledge?

True, he said.

Then opinion is not concerned either with being or with not-being?

Not with either.

And can therefore neither be ignorance nor knowledge?

That seems to be true.

But is opinion to be sought without and beyond either of them, in a
greater clearness than knowledge, or in a greater darkness than
ignorance?

In neither.

Then I suppose that opinion appears to you to be darker than knowledge,
but lighter than ignorance?

Both; and in no small degree.

And also to be within and between them?

Yes.

Then you would infer that opinion is intermediate?

No question.

But were we not saying before, that if anything appeared to be of a
sort which is and is not at the same time, that sort of thing would
appear also to lie in the interval between pure being and absolute
not-being; and that the corresponding faculty is neither knowledge nor
ignorance, but will be found in the interval between them?

True.

And in that interval there has now been discovered something which we
call opinion?

There has.

Then what remains to be discovered is the object which partakes equally
of the nature of being and not-being, and cannot rightly be termed
either, pure and simple; this unknown term, when discovered, we may
truly call the subject of opinion, and assign each to its proper
faculty, the extremes to the faculties of the extremes and the mean to
the faculty of the mean.

True.

This being premised, I would ask the