Taboo restrictions are distinct from religious or moral prohibitions. They are not based upon any divine ordinance, but may be said to impose themselves on their own account. They differ from moral prohibitions in that they fall into no system that declares quite generally that certain abstinences must be observed and gives reasons for that necessity.
Sigmund FreudI am not aware, however, that patients suffering from traumatic neurosis are much occupied in their waking lives with memories of their accident. Perhaps they are more concerned with not thinking of it.
Sigmund Freud