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 contrast between psychological temperaments outside the sphere of pathology. It is moreover easy to cull from literature numerous examples which bear witness to the actual existence of these two opposite types of mentality. Without pretending to exhaust the subject, I will give a few striking examples.

In my opinion, we owe the best observations on this subject to the philosophy of William James. He lays down the principle that no matter what may be the temperament of a “professional philosopher,” it is this temperament which he feels himself forced to express and to justify in his philosophy. And starting from this idea, which is altogether in accord with the spirit of psychoanalysis, divides philosophers into two classes: the “Tender-minded,” who are only interested in the inner life and spiritual things; and the “Tough-minded,” who lay most stress on material things and objective reality. We see that these two classes are actuated by exactly opposite tendencies of the libido: the “tender-minded” represent introversion, the “tough-minded” extraversion.

James says that the tender-minded are characterised by rationalism; they are men of principles and of systems, they aspire to dominate experience and to transcend it by abstract reasoning, by their logical deductions, and purely rational conceptions. They care little for facts, and the multiplicity of phenomena hardly embarrasses them at all: they forcibly fit data into their ideal constructions, and reduce everything to their a priori premises. This was the method of Hegel in settling beforehand the number of the planets. In the domain of mental pathology we again meet this kind of philosopher in paranoiacs, who, without being disquieted by the flat contradictions presented by experience, impose their delirious conceptions on the universe, and find means of interpreting everything, and according to Adler “arranging” everything, in conformity with their morbidly preconceived system.

The other traits which James depicts in this type follow