Even though a poem should be "wordless," according to our speaker, "Ars Poetica" still has words in it. (We went back and checked, just to be sure.) And since the speaker is talking about poetry and the ideas a poem might communicate, it's safe to say that we have some questions floating around concerning language and communication.
Language is a tricky thing when it comes to good poetry; it should make us feel something but it shouldn't scream at us at the same time. AT THE VERY LEAST AVOID ALL CAPS.
Words can never really communicate truths to us, whether in poetry or anywhere else, but they can make us feel "truth" as we perceive it. Far out.