Student or Learner
It is reasonable to conclude that limitations on the theoretical scope of the work is an inevitable consequence of space limitations. After all, even at 1859 pages, the CGEL [The Cambridge Grammar of the English Language] cannot tell us about everything, especially everything that cannot be said. [...] A position that we might attribute to CGEL is that in the ideal case, after saying what is possible, the impossible goes without saying.
(Review Article; Peter W. Culicover; pdf)
Would you be so kind as to explain to me what exactly it should mean?