In view of the foregoing we can now appreciate a fallacy which has been too commonly accepted in the interpretation of therapeutic facts. It is quite generally held that it is a necessity that the underlying unconscious complexes cannot be modified without bringing them to the “full light of day” by analysis. The facts of everyday observation do not justify this conclusion. The awakening of dormant memories of past experiences is mainly of importance for the purpose of giving us exact information of _what_ we need to modify, not necessarily for the purpose of effecting the modification. Owing to the fluidity of complexes, whether unconscious or conscious, our conscious ideas can become incorporated in unconscious complexes. This means that any new setting in which we may incorporate our conscious ideas to give them a new meaning becomes effective in the associations which these ideas have as a dormant complex. The latter is able to assimilate from the conscious any new material offered to it. Practical therapeutics and everyday experience abundantly have shown this. I have accomplished this, and I believe every therapeutist has done the same time and again. We should be cautious not to overlook common experience in the enthusiasm for new theories and dramatic observations. The difficulty is in knowing what we want to modify, and for this purpose analytical investigations of one sort or another are of the highest assistance, because they furnish us with the required information. If we recover the memories of the unconscious complex our task is easier, as we can apply our art with the greater skill.