It is characteristic of the urges of the “It” that they are always bent upon immediate, rash gratification without ever attaining their ends, but frequently exposing themselves to severe harm. Therefore, it devolves upon the “I” to forestall such failure, by mediating between the reckless demands of the “It” and the practical outer world. Thus, the censorial activity of the “I” makes itself felt in two different directions. On one hand, the “I,” assisted by that organ which conveys to it the reactions of an outer world, scans the horizon, as it were, in an attempt to seize upon the most opportune moment for a harmless gratification of the urges prompting it. On the other hand, the “I” exerts a restraining influence on the “It,” controlling its “passions” and inducing its urges to postpone their gratification, or modify them, or renounce them for some compensation, as the case may be. Restraining the reckless “It” in such a way, the “I” replaces the formerly predominant Pleasure Principle with the so-called Reality Principle which, although striving for the same ends as the Pleasure Principle, nevertheless considers such practical necessities as the outer world imposes. Later on, the “I” discovers that there is another way of insuring gratification of urges than adaptation to the outer world. This newly discovered method consists of changing conditions in the outer world in such a way as to bring about circumstances favorable for gratification. This activity of the “I” constitutes its most supreme achievement. Sufficient discernment to perceive when it is opportune to stifle passions and when it is opportune to either face or fight the realities of the outer world is, after all, the Alpha and Omega of practical wisdom. “As I understand you, the ‘It’ is by far the stronger of the two. How, then, is it possible that the ‘It’ will permit the weaker ‘I’ to hold sway over it?” The “I” is well in a position to exert such influence over the “It,” provided its organization and efficiency is in no way hampered. Besides, access to all parts of the “It” must be such as to enable the “I” to bear sufficient influence on the “It.” There is no inherent opposition between the “I” and the “It,” both belonging together. In cases of normal health, it is practically impossible to distinguish between the two. “All this appears quite clear to me. However, what I cannot understand is that under such ideal conditions, there could be any chance at all for disturbances to arise?” You are perfectly right! As long as the “I” discharges its duties fully, and its relations to the “It” are maintained in a satisfactory manner, no nervous disturbances will develop. However, disturbances are liable to arise at some unsuspected spot. This will not surprise the well-informed pathologist, but merely confirms the fact that the most essential developments and evolvements contain the very germ for diseased conditions and the break down of functions.