In the foreword to his 1968 work, Habermas, in addition to specifying that the function of psychoanalysis is illustrative in his theory, immediately clarifies that his knowledge of it "is limited to the study of Freud's writings" (Habermas 1972, 8). Therefore, no other school of psychoanalysis, or any "practical experience of analysis", is referenced in his work. However, he adds that the "Wednesday discussions" at the Sigmund Freud Institute in Frankfurt played an important role for him. In particular, as previously mentioned, Alfred Lorenzer's Sprachzerstörung und Rekonstruktion served as a fundamental reference.