Original English Freud quote, “words and magic”
In Freud's essay "Psychical (Or Mental) Treatment (1890)". I found the quote below with Google's help:


  Foremost among such measures is the use of words; and words are the essential tool of mental treatment. A layman will no
      doubt find it hard to understand how pathological disorders of the body and mind can be eliminated by ‘mere’ words. He will
      feel that he is being asked to believe in magic. And he will not be so very wrong, for the words which we use in our everyday
      speech are nothing other than watered-down magic.