The Republic Book X
is completely about this or at least I feel that it is as it relates to literature. But it also suggests that the word is alway phantasmal as compared to real physical thing or idea or ideal. Emerson a fairly neoplatonist on the idea says in "The Poet" that poems are pretty much prewritten and the writer pulls poem from the ideal though the writer can't do it perfectly so he/she must do there best to be honest to the ideal poem. So somewhere is this process word loses cohesion.
And the poem is meant to be an exaggeration it was a joke poems.
You're absolutely right. "In the beginning there was the word," that John cat was one wacky fella. I like him too though my religious choices aren't exactly Christianity.