One also finds abundant indications which show that even in healthy, not neurotic, persons resistances are found against the memory of disagreeable impressions and the idea of painful thoughts.[34] But the full significance of this fact can be estimated only when we enter into the psychology of neurotic persons. One is forced to make such elementary defensive striving against ideas which can awaken painful feelings, a striving which can be put side by side only with the flight-reflex in painful stimuli, as the main pillar of the mechanism which carries the hysterical symptoms. One need not offer any objection to the acceptance of such defensive tendency on the ground that we frequently find it impossible to rid ourselves of painful memories which cling to us, or to banish such painful emotions as remorse and reproaches of conscience. No one maintains that this defensive tendency invariably gains the upper hand, that in the play of psychic forces it may not strike against factors which stir up the contrary feeling for other purposes and bring it about in spite of it. _As the architectural principle of the psychic apparatus we may conjecture a certain stratification or structure of instances deposited in strata._ And it is quite possible that this defensive tendency belongs to a lower psychic instance, and is inhibited by higher instances. At all events, it speaks for the existence and force of this defensive tendency, when we can trace it to processes such as those found in our examples of forgetting. We see then that something is forgotten for its own sake, and where this is not possible the defensive tendency misses the target and causes something else to be forgotten--something less significant, but which has fallen into associative connection with the disagreeable material. The views here developed, namely, that painful memories merge into motivated forgetting with special ease, merits application in many spheres where as yet it has found no, or scarcely any, recognition. Thus it seems to me that it has not yet been strongly enough emphasized in the estimation of testimony taken in court,[35] where the putting of a witness under oath obviously leads us to place too great a trust on the purifying influence of his psychic play of forces. It is universally admitted that in the origin of the traditions and folklore of a people care must be taken to eliminate from memory such a motive as would be painful to the national feeling. Perhaps on closer investigation it may be possible to form a perfect analogy between the manner of development of national traditions and infantile reminiscences of the individual. The great Darwin has formulated a “golden rule” for the scientific worker from his insight into this pain-motive of forgetting.[36]