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Sigmund Freud skriver til sin venn Wilhelm Fliess i Berlin (her gjengitt i engelsk oversettelse -- originalen er på tysk):
"I know that at the moment I am useless as a correspondent, with no right to any claims, but it was not always so and it will not remain so. I still do not know what has been happening to me. Something from the deepest depths of my own neurosis set itself against any advance in the understanding of the neuroses, and you have somehow been involved in it.
