Kubie, L. S. (1934). The psychoanalyst's point of view. In M. Bentley & E. V. Cowdry, The problem of mental disorder: A study undertaken by the Committee on Psychiatric Investigations, National Research Council (pp. 71-90). New York, NY, US: McGraw-Hill Book Company.
http://dx.doi.org/10.1037/13323-005
Psychic Determination of the Disorders. It is the point of view of psychoanalysis that every psychological production in an individual's life, whether it be normal or pathological, is a composite outcome of earlier physiological events and biographical occurrences. No one has stressed this fact more emphatically or more explicitly than Freud; and he has warned his followers repeatedly that there are limits to the realm in which psychogenetic forces play the dominant role. It is exceedingly difficult, however, to define clearly the boundaries of that realm; and we tend therefore to shrink or to expand it, not on the basis of scientific observations but rather in accordance with individual and emotional bias. For this reason, it would seem that in the present state of our knowledge, the only sound approach is the empirical approach. Let the physiologist make his investigations, and let the worker whose training and aptitude are in a more psychological sphere take every individual case, or even each individual symptom, and see how completely the conscious and the unconscious history of that case or symptom suffices as an explanation. In both cases the aim is identical, i.e., to find a variable factor with which to account for the deviation from an accepted norm. The organicist seeks the variable in some aspect of physical structure; the analyst seeks it in some aspect of human experience. It is only an unresolved emotional bias which makes either party belittle the efforts of the other or contend that all variables will be found by his own particular approach. (PsycINFO Database Record (c) 2016 APA, all rights reserved)