The article aims to examine the poetry of thought of Euclides da Cunha (1866–1909), highlighting in his peculiar language of a poet-engineer the alliance between science and art, which is of great significance in his aesthetic project as speech and action and, consequently, as a political act. It seeks to defend, in this sense, the shared place located in the writings of Euclides between dream and thought, feeling and reason, poetry and science, considering the reflection as a constitutive element of his work, so as understood by German Romantics, with the meaning of deep inquiry of the self, through the enhancement of relationship between reason and feeling. It takes as a theoretical-philosophical support the concept of romantic irony, acc...