People’s reason for wanting a definition is to take care of the borderline case, and this is what a definition, as if by definition, will not do. That is, if an individual asks for a definition of poetry, it will most certainly not be the case that he has never seen one of the objects called poems that are said to embody poetry; on the contrary, he is already tolerably certain what poetry in the main is, and his reason for wanting a definition is either that his certainty has been challenged by someone else or that he wants to take care of a possible or seeming exception to it: hence the perennial squabble about distinguishing poetry from prose, which is rather like distinguishing rain from snow—everyone is reasonably capable of doing so, and yet there are some weathers that are either-neither.
American poet Robert Frost said shrewdly that poetry was what got left behind in translation, which suggests a criterion of almost scientific refinement: when in doubt, translate; whatever comes through is prose, the remainder is poetry. And yet to even so acute a definition the obvious exception is a startling and a formidable one: some of the greatest poetry in the world is in the Authorized or King James Version of the Bible, which is not only a translation but also, as to its appearance in print, identifiable neither with verse nor with prose in English but rather with a cadence owing something to both.
