This article addresses the question of nationalism's founding principles in relation with the Münchhausen's trilemma, in the purpose of establishing the nationalism's discursive dimension, which takes place, ideally, in an open public space. We criticize ''ontological nationalism'' and its regrettable tendency to proclaim the “already-nation”, namely, a nation without a possibility of knowledge for the subjects, and where individual discourses about the nation are thus immediately blocked by an already-true interpretation of the nation. Such an interpretation of the already-nation ignores the differentiation between nationalism as a general interpretative setting, and the statements coming out of it, since these statements are the individuals' sole responsibility. The nation is in fact the representation of the power of language itself, which only exists within the thread of meaning created by the nationalist discourses of the public sphere.