Sigmund Freud skriver til sin elskede venn Wilhelm Fliess, gratulerer ham med hans nyfødte sønn og forklarer hva han ser som sitt mål som forsker

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)."