The Ego and the Id

by Sigmund Freud

We recognize that the Ucs. does not coincide with the repressed; it is still true that all that is repressed is Ucs., but not all that is Ucs. is repressed.

Moreover, the ego seeks to bring the influence of the external world to bear upon the id and its tendencies, and endeavours to substitute the reality principle for the pleasure principle which reigns unrestrictedly in the id.

These creatures die in the act of reproduction because, after Eros has been eliminated through the process of satisfaction, the death instinct has a free hand for accomplishing its purposes. Finally, as we have seen, the ego, by sublimating some of the libido for itself and its purposes, assists the id in its work of mastering the tensions.