The Interpretation of Dreams by Sigmund Freud Chapter 2 Page 45

and more intellectual performance; but analysis shows conclusively every time that these intellectual operations were already present in the dream thoughts, and have only been taken over by the dream content. A syllogism in the dream is nothing other than the repetition of a syllogism in the dream thoughts; it seems inoffensive if it has been transferred to the dream without alteration; it becomes absurd if in the dream work it has been transferred to other matter. A calculation in the dream content simply means that there was a calculation in the dream thoughts; whilst this is always correct, the calculation in the dream can furnish the silliest results by the condensation of its factors and the displacement of the same operations to other things.

Even speeches which are found in the dream content are not new