Is Rhyme Indispensable?

Although I particularly appreciate rhymed verse, I would never endorse Bilac and Guimarães Passos, who maintained “that in any verse composition one must not prescind from rhyme. It is indispensable”. There are several reasons for this. But one of them deserves special mention. I do not know how the aforementioned poets composed, but it seems necessary to me, after skipping the whole process of ideation of the poem, that a draft be made of it. If I want to make rhymes, then I first sketch the poem in blank verse, to then concentrate on the rhythm, the rhymes, and the careful selection of words. I realize clearly that if I were to worry about rhymes at this point in the draft, it would only hinder my creative impulse, interrupting the flow of ideas to open a dictionary, something absolutely counterproductive. Therefore, I have to conclude that this creative impulse, in its spontaneous form, calls for manifestation in blank verse—not to say free verse. Well then: I know that not every great artistic effect is spontaneous, quite the contrary, as almost all the brilliance of a work comes from carefully thought out details. Rhyme, therefore, although an artificiality, is justified. But practice shows, time and time again, that to rhyme verses is to adulterate them, and even though one may gain in beauty by doing so, that initial naturalness is lost. Finally, I get where I want to go. There will be verses in which the poet will be so stimulated that he will feel himself emotionally pouring his soul out onto the paper; verses that will come out like an avalanche, that will express his innermost self and will spring forth with a momentum and sharpness different from what he normally creates. I am not sure how much is gained by rhyming such verses, I mean, it seems to me that the poet who deforms them to fit formalities may commit a crime against himself and insult the very singular moment in which he conceived them.