The Republic by Plato Part 10 Page 20

In like manner the poet with his words and phrases may be said to lay on the colours of the several arts, himself understanding their nature only enough to imitate them; and other people, who are as ignorant as he is, and judge only from his words, imagine that if he speaks of cobbling, or of military tactics, or of anything else, in metre and harmony and rhythm, he speaks very well — such is the sweet influence which melody and rhythm by nature have. And I think that you must have observed again and again what a poor appearance the tales of poets make when stripped of the colours which music puts upon them, and recited in simple prose.

Yes, he said.

They are like faces which were never really beautiful, but only blooming; and now the bloom of youth has passed away from them?