“After the elements have been distinguished, let us comment on what sort of organization is needed for the events of the plot, since this is the foremost and greatest feature of tragedy. Our proposal is that tragedy is the imitation of a complete and whole deed, and one that has some kind of magnitude (since it is possible for a thing to be whole and to lack magnitude). A story that is whole has a beginning, middle and an end. The beginning is the very thing which does not necessarily follow something else but after which something else naturally follows or happens. The end, in contrast, is the very thing that happens after something else either as a necessary result or, is most common companion, but after which nothing else occurs. A middle is that thing which comes after something else and has something follow it. It is necessary that a well-constructed tale does not begin or just end anywhere but will apply the conditions I have described.”
Διωρισμένων δὲ τούτων, λέγωμεν μετὰ ταῦτα ποίαν τινὰ δεῖ τὴν σύστασιν εἶναι τῶν πραγμάτων, ἐπειδὴ τοῦτο καὶ πρῶτον καὶ μέγιστον τῆς τραγῳδίας ἐστίν. κεῖται δὴ ἡμῖν τὴν τραγῳδίαν τελείας καὶ ὅλης πράξεως εἶναι μίμησιν ἐχούσης τι μέγεθος• ἔστιν γὰρ ὅλον καὶ μηδὲν ἔχον μέγεθος. ὅλον δέ ἐστιν τὸ ἔχον ἀρχὴν καὶ μέσον καὶ τελευτήν. ἀρχὴ δέ ἐστιν ὃ αὐτὸ μὲν μὴ ἐξ ἀνάγκης μετ’ ἄλλο ἐστίν, μετ’ ἐκεῖνο δ’ ἕτερον πέφυκεν εἶναι ἢ γίνεσθαι• τελευτὴ δὲ τοὐναντίον ὃ αὐτὸ μὲν μετ’ ἄλλο πέφυκεν εἶναι ἢ ἐξ ἀνάγκης ἢ ὡς ἐπὶ τὸ πολύ, μετὰ δὲ τοῦτο ἄλλο οὐδέν• μέσον δὲ ὃ καὶ αὐτὸ μετ’ ἄλλο καὶ μετ’ ἐκεῖνο ἕτερον. δεῖ ἄρα τοὺς συνεστῶτας εὖ μύθους μήθ’ ὁπόθεν ἔτυχεν ἄρχεσθαι μήθ’ ὅπου ἔτυχε τελευτᾶν, ἀλλὰ κεχρῆσθαι ταῖς εἰρημέναις ἰδέαις.