§12.27a.1λοιπὸν δὲ τὸ πραγματικὸν αὐτῷ μέρος τῆς ἱστορίας ἐκ πάντων σύγκειται τῶν ἁμαρτημάτων, ὧν τὰ πλεῖστα διεληλύθαμεν·
And furthermore, the practical part of his history is composed of all kinds of errors, the majority of which we have already gone through.
§12.27a.2τὴν δʼ αἰτίαν τῆς ἁμαρτίας νῦν ἐροῦμεν, ἥτις οὐκ ἔνδοξος μὲν φανεῖται τοῖς πλείστοις, ἀληθινωτάτη δʼ εὑρεθήσεται τῶν Τιμαίου κατηγορημάτων.
Now we shall state the cause of this error, which, though it will not seem plausible to most people, will be found to be the truest of the accusations against Timaeus.
§12.27a.3δοκεῖ μὲν γὰρ καὶ τὴν ἐμπειρικὴν περὶ ἕκαστα δύναμιν καὶ τὴν ἐπὶ τῆς πολυπραγμοσύνης ἕξιν παρεσκευάσθαι καὶ συλλήβδην φιλοπόνως προσεληλυθέναι πρὸς τὸ γράφειν τὴν ἱστορίαν, §12.27a.4ἐν ἐνίοις δʼ οὐδεὶς οὔτʼ ἀπειρότερος οὔτʼ ἀφιλοπονώτερος φαίνεται γεγονέναι τῶν ἐπʼ ὀνόματος συγγραφέων.
For he seems, on the one hand, to have equipped himself with both empirical capacity regarding individual details and the habit of inquiry, and in short, to have approached the writing of history with industriousness; but on the other hand, in some matters no one of the distinguished writers appears to have been more inexperienced or more lacking in industry than he.
δῆλον δʼ ἔσται τὸ λεγόμενον ἐκ τούτων.
What is being said will become clear from the following.