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Berggasse 19,
Vienna IX,
30.3.1909
Dear Dr Pfister,
Jung left yesterday evening, but I obviously had no complaints about you to make to him, because all you have done is what he and I myself have done, that is to say, published material according to the state of your knowledge at the time and modified it later in accordance with the progress of your knowledge. In so doing we give the uninformed reader enough that is new, and more than he is ready to take. The value of what we write must depend on its containing nothing accepted on authority, but only what can be stated as the direct outcome of our own troublesome labours.