Let me begin with an optimistic observation. All discourse is intentional and premeditated. Perhaps we are considering events transacted in nanoseconds, but I insist that almost all human activity is premeditated. Poetry, as we all know, is an often effective remedy for the sometimes life-threatening, ailment of spontaneous speech.
Poetry is formulaic language, a cure for blurting.
Whenever poetic speech pretends to be vernacular language it does so with the power of all deliberate artifice and a disclaimer should flash across the screen of your brain and be imprinted in the wax of your ears. Just to digress, I must mention my favorite disclaimer from a sleazy TV station in Houston. But, as Max Shulman once said, I digress. Actually, Max Shulman said that thousands of times. The relationship between poetic diction and the vernacular utterances of everyday life is adversarial and parasitic in both directions.