Sigmund Freud skriver til sin venn Wilhelm Fliess i Berlin (her gjengitt i engelsk oversettelse -- originalen er på tysk):
"The thought that both of us are occupied with the same work is the most enjoyable one I can concieve at present. I see how, via the detour of medical practice, you are reaching your first ideal of understanding human beings as a physiologist, just as I most secretly nourish the hope of arriving, via these same paths, at my initial goal of philosophy. For that is what I wanted originally, when it was not yet at all clear to me to what end I was in the world. (s. 159)."
Freud, S., et al. (1985). The complete letters of Sigmund Freud to Wilhelm Fliess : 1887-1904. Cambridge, Mass, Belknap Press of Harvard University Press.
Utdrag gjengitt her: