§1.1.1τοὺς εἰωθότας ἀποδίδοσθαι τοῖς προοιμίοις τῶν ἱστοριῶν λόγους ἥκιστα βουλόμενος ἀναγκάζομαι περὶ ἐμαυτοῦ προειπεῖν, οὔτʼ ἐν τοῖς ἰδίοις μέλλων πλεονάζειν ἐπαίνοις, οὓς ἐπαχθεῖς οἶδα φαινομένους τοῖς ἀκούουσιν, οὔτε διαβολὰς καθʼ ἑτέρων ἐγνωκὼς ποιεῖσθαι συγγραφέων, ὥσπερ Ἀναξιμένης καὶ Θεόπομπος ἐν τοῖς προοιμίοις τῶν ἱστοριῶν ἐποίησαν, ἀλλὰ τοὺς ἐμαυτοῦ λογισμοὺς ἀποδεικνύμενος, οἷς ἐχρησάμην ὅτε ἐπὶ ταύτην ὥρμησα τὴν πραγματείαν, καὶ περὶ τῶν ἀφορμῶν ἀποδιδοὺς λόγον, ἐξ ὧν τὴν ἐμπειρίαν ἔλαβον τῶν γραφησομένων. §1.1.2ἐπείσθην γὰρ ὅτι δεῖ τοὺς προαιρουμένους μνημεῖα τῆς ἑαυτῶν ψυχῆς τοῖς ἐπιγιγνομένοις καταλιπεῖν, ἃ μὴ συναφανισθήσεται τοῖς σώμασιν αὐτῶν ὑπὸ τοῦ χρόνου, καὶ πάντων μάλιστα τοὺς ἀναγράφοντας ἱστορίας, ἐν αἷς καθιδρῦσθαι τὴν ἀλήθειαν ὑπολαμβάνομεν ἀρχὴν φρονήσεώς τε καὶ σοφίας οὖσαν, πρῶτον μὲν ὑποθέσεις προαιρεῖσθαι καλὰς καὶ μεγαλοπρεπεῖς καὶ πολλὴν ὠφέλειαν τοῖς ἀναγνωσομένοις φερούσας, ἔπειτα παρασκευάζεσθαι τὰς ἐπιτηδείους εἰς τὴν ἀναγραφὴν τῆς ὑποθέσεως ἀφορμὰς μετὰ πολλῆς ἐπιμελείας τε καὶ φιλοπονίας. §1.1.3οἱ μὲν γὰρ ὑπὲρ ἀδόξων πραγμάτων ἢ πονηρῶν ἢ μηδεμιᾶς σπουδῆς ἀξίων ἱστορικὰς καταβαλόμενοι πραγματείας, εἴτε τοῦ προελθεῖν εἰς γνῶσιν ὀρεγόμενοι καὶ τυχεῖν ὁποιουδήποτε ὀνόματος, εἴτε περιουσίαν ἀποδείξασθαι τῆς περὶ λόγους δυνάμεως βουλόμενοι, οὔτε τῆς γνώσεως ζηλοῦνται παρὰ τοῖς ἐπιγιγνομένοις οὔτε τῆς δυνάμεως ἐπαινοῦνται, δόξαν ἐγκαταλιπόντες τοῖς ἀναλαμβάνουσιν αὐτῶν τὰς ἱστορίας, ὅτι τοιούτους ἐζήλωσαν αὐτοὶ βίους, οἵας ἐξέδωκαν τὰς γραφάς· ἐπιεικῶς γὰρ ἅπαντες νομίζουσιν εἰκόνας εἶναι τῆς ἑκάστου ψυχῆς τοὺς λόγους. §1.1.4οἱ δὲ προαιρούμενοι μὲν τὰς κρατίστας ὑποθέσεις, εἰκῆ δὲ καὶ ῥᾳθύμως αὐτὰς συντιθέντες ἐκ τῶν ἐπιτυχόντων ἀκουσμάτων, οὐδένα ὑπὲρ τῆς προαιρέσεως ἔπαινον κομίζονται· οὐ γὰρ ἀξιοῦμεν αὐτοσχεδίους οὐδὲ ῥᾳθύμους εἶναι τὰς περί τε πόλεων ἐνδόξων καὶ ἀνδρῶν ἐν δυναστείᾳ γεγονότων ἀναγραφομένας ἱστορίας. §1.1.5ταῦτα δὴ νομίσας ἀναγκαῖα καὶ πρῶτα θεωρήματα τοῖς ἱστορικοῖς εἶναι καὶ πολλὴν ποιησάμενος ἀμφοτέρων ἐπιμέλειαν οὔτε παρελθεῖν τὸν ὑπὲρ αὐτῶν λόγον ἐβουλήθην, οὔτε ἐν ἄλλῳ τινὶ τόπῳ καταχωρίσαι μᾶλλον ἢ τῷ προοιμίῳ τῆς πραγματείας.
\nAlthough I least of all wish to deliver those speeches that are customarily assigned to the prefaces of histories, I am forced to speak beforehand about myself; neither intending to be excessive in my own praises, which I know appear offensive to those who hear them, nor having resolved to make accusations against other writers, as Anaximenes and Theopompus did in the prefaces of their histories, but rather to set forth my own reasoning, which I employed when I embarked upon this study, and to give an account of the resources from which I acquired my experience of the events to be written about.\n\nFor I am convinced that those who choose to leave behind for posterity monuments of their own souls, which will not perish together with their bodies by the effect of time, and most of all those who write histories, in which we believe truth is established as the source of prudence and wisdom, must first of all choose subjects that are noble and magnificent and bring great utility to those who will read them, and secondly prepare with much diligence and industry the appropriate resources for the recording of the subject.\n\nFor those who undertake historical works on obscure, wicked, or worthless subjects, whether because they long to come into notice and acquire any kind of reputation whatsoever, or because they wish to display an abundance of their rhetorical power, are neither envied for their knowledge by posterity nor praised for their power, but they leave behind to those who take up their histories the reputation of having themselves admired such lives as the writings they published; for almost all men naturally believe that words are the images of each individual's soul.\n\nBut those who choose the best subjects, yet compose them carelessly and negligently from random rumors, receive no praise for their choice; for we do not think it right that histories recorded about famous cities and men who have been in power should be improvised or negligent.\n\nBelieving, then, that these are necessary and primary principles for historians, and having paid great attention to both, I did not wish to pass over the discussion of them, nor to place it in any other part rather than in the preface of my work.