Ensastas and philosophers already were worried, then, with the essence of the poetry, in an attempt disconnect it of the matrix ondefermentara with other expressions, that also had been conquering autonomy epassando, for similar characteristics, to the quality of sorts. The poetry, on to the structure of the narrative, is the expressoartstica that more quarrels have excited in relation to its essence. Between Greek osfilsofos and the modern studies of ensasta North American SusanneLanger have a long interpretativa scale. For it, the poetry is not maisrepresentativa, therefore it was disentailed of the concern to imitate the nature. Oingls Herbert Read, also, arrives the similar conclusions, when estabelecea difference between poetry and chats: ' ' in it chats, the words imply, generally, the analysis of a mental state, to the step that in palavrasaparecem them to the poetry as objective things, that keep one definite equivalence with estadode mental intensity of poeta.' ' Poets and readers, critics and historians, theoreticians eprofessores have referred themselves, to the long one of history, to the poetry and the poem, oracomo distinct things, however as identified things. They are innumerable astentativas of definition, but none presented with the necessary universality and origor to its aesthetic, philosophical or scientific affirmation as deLyra. For Peter Lyra (1986: 06) the poetry is situated in problematic way in doisgrandes conceptual groups: however as a pure and complex incorporeal, previous substance to the independent poet and of the poem and the language, and that only seconcretiza in words as content of the poem, by means of the activity human being; oracomo the condition of this indefinite and absorbent activity human being. Already in the vision of Guillermo de Geir Fields, ' ' poetry antes of everything, communication effected by words only, of a contedopsquico (affective-sensrio-conceptual), accepted for the spirit as a whole, umasntese' '. In this psychic content the sensrio will predominate to the times, outrasvezes the affective one, others the conceptual one, therefore the poet when expressing itself nuncatransmite pure concepts, wants to say, it never transmits concepts without mixture desensorialidade or sentimentalidade.