In this sexual activity of the first years of childhood, the concomitant constitution could finally attain its rights. Disposition and experience here became associated into an inseparable etiological unity, in that the disposition raised certain impressions to inciting and fixed traumas, which otherwise would have remained altogether banal and ineffectual, whilst the experiences evoked factors from the disposition which, without them, would have continued to remain dormant, and, perhaps, undeveloped. The last word in the question of traumatic etiology was later on said by Abraham, when he drew attention to the fact that just the peculiar nature of the child’s sexual constitution enables it to provoke sexual experiences of a peculiar kind, that is to say, traumas. My formulations concerning the sexuality of the child were founded at first almost exclusively on the results of the analyses of adults, which led back into the past. I was lacking in opportunity for direct observation of the child. It was, therefore, an extraordinary triumph when, years later, my discoveries were successfully confirmed for the greater part by direct observation and analyses of children of very early years, a triumph that appeared less and less on reflecting that the discovery was of such a nature that one really ought to be ashamed of having made it. The deeper one penetrated into the observation of the child, the more self-evident this fact seemed, and the more strange, too, became the circumstances that such pains had been taken to overlook it. To be sure, so certain a conviction of the existence and significance of the infantile sexuality can be obtained only, if one follows the path of analysis, if one goes back from the symptoms and peculiarities of neurotics to their uttermost sources, the discovery of which explains what is explainable in them, and permits of modifying what can be changed. I understand that one can arrive at different conclusions if, as was recently done by C. G. Jung, one first forms for one’s self a theoretical conception of the nature of the sexual impulse and thereby tries to understand the life of the child. Such a conception can only be chosen arbitrarily or with regard to secondary considerations, and is in danger of becoming inadequate to the sphere in which it was to be utilized. Doubtless, the analytic way also leads to certain final difficulties and obscurities in regard to sexuality and its relation to the whole life of the individual; but these cannot be set aside by speculations, and must wait till solutions will be found by means of other observations or of observations in other spheres.