Protagoras

by Plato

To which the only opposite is the evil?

There is no other.

And there is the acute in sound?

True.

To which the only opposite is the grave?

There is no other, he said, but that.

Then every opposite has one opposite only and no more?

He assented.

Then now, I said, let us recapitulate our admissions. First of all we admitted that everything has one opposite and not more than one?

We did so.