Archaeology tries to define not the thoughts, representations, images, themes, preoccupations that are concealed or revealed in discourses; but those discourses themselves, those discourses as practices obeying certain rules. It does not treat discourse as document, as a sign of something else, as an element that ought to be transparent, but whose unfortunate opacity must often be pierced if one is to reach at last the depth of the essential in the place in which it is held in reserve; it is concerned with discourse in its own volume, as a monument. It is not an interpretative discipline: it does not seek another, better-hidden discourse. It refuses to be “allegorical.”
Michel Foucault, The Archeology of Knowledge and the Discourse on Language, 1971