The Republic by Plato Part 5 Page 104

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 gentleman who is of opinion that there is no absolute or unchangeable idea of beauty — in whose opinion the beautiful is the manifold — he, I say, your lover of beautiful sights, who cannot bear to be told that the beautiful is one, and the just is one, or that anything is one — to him I would appeal, saying, Will you be so very kind, sir, as to tell us whether, of all these beautiful things, there is one which will not be found ugly; or of the just, which will not be found unjust; or of the holy, which will not also be unholy?

No, he replied; the beautiful will in some point of view be found ugly; and the same is true of the rest.