Poetry is creative expression; poetry is constructive expression. That, in a sentence, is the real distinction.... In poetry the words are born or re-born in the act of thinking. The words are, in Bergsonian phraseology, a becoming; they develop in the mind pari passu with the development of the thought. There is no time interval between the words and the thought. The thought is the word and the word is the thought, and both the thought and the word are Poetry. "Constructive" implies ready-made materials; words stacked round the builder, ready for use. Prose is a structure of ready-made words. Its "creative" function is confined to plan and elevation—functions these, too, of Poetry, but in Poetry subsidiary to the creative function.