Humboldt language theory may be part of an epistemology in which the general problem of knowledge is open to the (relativistic face) thesis that language is not unconnected to the formation of conceptual networks and various epistemological perspectives, but on the contrary is an indispensable condition in the construction of knowledge; but it is to such a degree that the relationship between language and thought can be conceived not as much as the one between the instrument and the product, but as an identity relationship. Most importantly, however, that identity is a question of fact: Humboldt’s linguistic relativism is not unrealistic.