The Interpretation of Dreams by Sigmund Freud
V.

Lest it may seem too easy a matter to draw conclusions from dreams concerning the dreamer's real circumstances, I add another dream originating with the same person, which once more appears innocent. "I dreamt of doing something," she relates, "which I actually did during the day, that is to say, I filled a little trunk so full of books that I had difficulty in closing it. My dream was just like the actual occurrence." Here the dreamer herself emphasizes the correspondence between the dream and the reality. All such criticisms of the dream, and comments on the dream, although they have found a place in the waking thoughts, properly belong to the latent dream-content, as further examples will confirm. We are told, then, that what the dream relates has actually occurred during the day. It would take us too far afield to show how we arrive at the idea of making use of the English language to help us in the interpretation of this dream. Suffice it to say that it is again a question of a little box (cf. chap. IV, the dream of the dead child in the box) which has been filled so full that nothing can go into it.

In all these "innocent" dreams the sexual factor as the motive of the censorship is very prominent. But this is a subject of primary significance, which we must consider later.