The Interpretation of Dreams by Sigmund Freud Chapter 3 Page 19

roundabout method by a change in the external world. For this reason it is rare for him to have his wishes realized during sleep in the short psychical way. It is even possible that this never happens, and that everything which appears to us like a child's dream demands a much more elaborate explanation. Thus it is that for adults — for every sane person without exception — a differentiation of the psychical matter has been fashioned which the child knew not. A psychical procedure has been reached which, informed by the experience of life, exercises with jealous power a dominating and restraining influence upon psychical emotions; by its relation to consciousness, and by its spontaneous mobility, it is endowed with the greatest means of psychical power.

A portion of the infantile emotions has been withheld