The Republic by Plato Part 5 Page 92

Certainly not, I replied; they are only an imitation.

He said: Who then are the true philosophers?

Those, I said, who are lovers of the vision of truth.

That is also good, he said; but I should like to know what you mean?

To another, I replied, I might have a difficulty in explaining; but I am sure that you will admit a proposition which I am about to make.

What is the proposition?

That since beauty is the opposite of ugliness, they are two?

Certainly.

And inasmuch as they are two, each of them is one?

True again.