Goethe once confessed that some of his writing projects such as Prometheus, Tantalus, Ixion and Sisyphus have later on become part of his deeper and higher quality play entitled "Ifigenia". A part of the success of his play was in fact due to these imperfect, unaccomplished writings of his.
The verbal formula is most often preceded and generated by a powerful spiritual tension. If this tension is maintained, it can ensure the unity of the artwork. As Ribot used to say, the development can go from details to the unity of the work or vice versa; in both cases, the mutual connection of details and the hierarchy of the elements are established.
H. Delacroix says that the work of art is organized by the conquest of a material which is at the same time rebellious and obedient. The abstract or concrete techniques often impose themselves upon the artist's labor.
Of course, poets may not calculate their effects, but good poets have intuition, they have the ability to sense the potential effects of their poetry and they are only content when they discover the perfect way of expressing their ideas.