This article is a defense of a philosophy of psychoanalysis with no interference whatever in the autonomy of the analyzed discipline. To comply with this objective, the Wittgensteinian philosophical method and its related concepts of grammar, grammatical description, and therapy, are being proposed. Such therapeutical objects of comparison are then applied to a case of use of psychoanalytic concepts in a text from Lacan's Seminar XV , to show a practical example of the kind of philosophy that we favor.