Jung says the following in his introduction: "in these lectures I have attempted to reconcile my practical experiences in psychoanalysis with the existing theory, or rather, with the approaches to such a theory." He goes on to say, "Here is my attitude towards those principles which my honored teacher Sigmund Freud has evolved from the experience of many decades." Some topics considered in this light are infantile sexuality, the conception of the libido, the unconscious, the dream, repression, and the etiology of neuroses.