A multi–dimensional mathematical theory applied to texts belonging to classical Greek Literature spanning eight centuries reveals interesting connections between them. By studying words, sentences and interpunctions of texts, the theory defines deep–language parameters and linguistic communication channels. These mathematical entities are due to writer’s unconscious design and can reveal connections between texts far beyond writers’ awareness. The analysis, based on 3,225,839 words contained in 118,952 sentences, shows that ancient Greek writers, and their readers, were not significantly different from modern writers/readers. Their sentences were processed by an extended short–term memory, modelled with two independent processing units in series, just like modern readers. In a society in which people were used to memorize information more than modern people do, the ancient writers wrote almost exactly, mathematically speaking, as modern writers do and for readers of similar characteristics. Since meaning is not considered, any text of any alphabetical language can be studied exactly with the same mathematical/statistical tools and allows comparisons, regardless of different languages and epoch of writing.