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If today, as a person approaching his seventies, I look back at the course of my scientific development, at the end result of my life’s work, I can say with complete justification that what I have achieved I owe for the most part to those influences as a result of which the ability to make decisions was placed in my own hands. With all clarity I was able to discover in myself that the workings so readily invoked to clarify one’s fate have no validity at all. Everything happened the way it had to happen. A long series of personal and material influences that were exerted on me since my childhood and generally followed each other in a purposeful way finally brought about that which I can count as the total gain from my scientific work.

NIH-98-134: Contemporary Medicine as Presented by its Practitioners Themselves, Leipzig, 1923:217–250