_The Psychological Explanation of the above Fact._ To trace something unfamiliar back to something familiar, is at once a relief, a comfort and a satisfaction, while it also produces a feeling of power. The unfamiliar involves danger, anxiety and care,—the fundamental instinct is to get rid of these painful circumstances. First principle: any explanation is better than none at all. Since, at bottom, it is only a question of shaking one’s self free from certain oppressive ideas, the means employed to this end are not selected with overmuch punctiliousness: the first idea by means of which the unfamiliar is revealed as familiar, produces a feeling of such comfort that it is “held to be true.” The proof of happiness (“of power”) as the criterion of truth. The instinct of causality is therefore conditioned and stimulated by the feeling of fear. Whenever possible, the question “why?” should not only educe the cause as cause, but rather a certain kind of cause—a comforting, liberating and reassuring cause. The first result of this need is that something known or already experienced, and recorded in the memory, is posited as the cause. The new factor, that which has not been experienced and which is unfamiliar, is excluded from the sphere of causes. Not only do we try to find a certain kind of explanation as the cause, but those kinds of explanations are selected and preferred which dissipate most rapidly the sensation of strangeness, novelty and unfamiliarity,—in fact the most ordinary explanations. And the result is that a certain manner of postulating causes tends to predominate ever more and more, becomes concentrated into a system, and finally reigns supreme, to the complete exclusion of all other causes and explanations. The banker thinks immediately of business, the Christian of “sin,” and the girl of her love affair. 6