Plutarch’s “To the Uneducated Ruler” has no relevance today, at all (780a-c)...
“The majority of kings and rulers are stupid–they imitate those artless sculptors who believe that their over-sized figures seem large and solid if they make them with a wide stance, flexing their muscles, mouths gaped open. For these types of rulers seem merely to be imitating the impressiveness and seriousness of leadership with their deep voice, severe glance, bitter manners and their separate way of living: but they are not really any different from the sculpted colossus which is heroic and godly on the outside, but filled with dirt, stone or lead within.
The real difference is that the weight of the statue keeps it standing straight, never leaning; these untaught generals and leaders often wobble and overturn because of their native ignorance. For, because they have built their homes on a crooked foundation, they lean and slide with it. Just as a carpenter’s square, if it is straight and solid, straightens out everything else that is measured according to it, so too a leader must first master himself and correct his own character and only then try to guide his people. For one who is falling cannot lift others; one who is ignorant cannot teach; one who is simple cannot manage complicated affairs; one who is disordered cannot create order; and one who does not rule himself cannot rule.”
Ἀλλὰ νοῦν οὐκ ἔχοντες οἱ πολλοὶ τῶν βασιλέων καὶ ἀρχόντων μιμοῦνται τοὺς ἀτέχνους ἀνδριαντοποιούς, οἳ νομίζουσι μεγάλους καὶ ἁδροὺς φαίνεσθαι τοὺς κολοσσούς, ἂν διαβεβηκότας σφόδρα καὶ διατεταμένους καὶ κεχηνότας πλάσωσι· καὶ γὰρ οὗτοι βαρύτητι φωνῆς καὶ βλέμματος τραχύτητι καὶ δυσκολίᾳ τρόπων καὶ ἀμιξίᾳ διαίτης ὄγκον ἡγεμονίας καὶ σεμνότητα μιμεῖσθαι δοκοῦσιν, οὐδ᾿ ὁτιοῦν τῶν κολοσσικῶν διαφέροντες ἀνδριάντων, οἳ τὴν ἔξωθεν ἡρωικὴν καὶ θεοπρεπῆ μορφὴν ἔχοντες ἐντός εἰσι γῆς μεστοὶ καὶ λίθου καὶ μολίβδου· πλὴν ὅτι τῶν μὲν ἀνδριάντων ταῦτα τὰ βάρη τὴν ὀρθότητα μόνιμον καὶ ἀκλινῆ διαφυλάττει, οἱ δ᾿ ἀπαίδευτοι στρατηγοὶ καὶ ἡγεμόνες ὑπὸ τῆς ἐντὸς ἀγνωμοσύνης πολλάκις σαλεύονται καὶ περιτρέπονται· βάσει γὰρ οὐ κειμένῃ πρὸς ὀρθὰς ἐξουσίαν ἐποικοδομοῦντες ὑψηλὴν συναπονεύουσι. δεῖ δέ, ὥσπερ ὁ κανὼν αὐτός, ἀστραβὴς γενόμενος καὶ ἀδιάστροφος, οὕτως ἀπευθύνει τὰ λοιπὰ τῇ πρὸς αὑτὸν ἐφαρμογῇ καὶ παραθέσει συνεξομοιῶν, παραπλησίως τὸν ἄρχοντα πρῶτον τὴν ἀρχὴν κτησάμενον ἐν ἑαυτῷ καὶ κατευθύναντα τὴν ψυχὴν καὶ καταστησάμενον τὸ ἦθος οὕτω συναρμόττειν τὸ ὑπήκοον· οὔτε γὰρ πίπτοντός ἐστιν ὀρθοῦν οὔτε διδάσκειν ἀγνοοῦντος οὔτε κοσμεῖν ἀκοσμοῦντος ἢ τάττειν ἀτακτοῦντος ἢ ἄρχειν μὴ ἀρχομένου·
“Among the weak, base and private citizens, ignorance when combined with a lack of power yields little wrongdoing, as in nightmares some trouble upsets the mind, making it incapable of responding to its desires. But when power has been combined with wickedness it adds energy to latent passions. And so that saying of Dionysus is true—for he used to say that he loved his power most when he could do what he wanted quickly. It is truly a great danger when one who wants what is wrong has the power to do what he wants to do.
As Homer puts it “When the plan was made, then the deed was done.” When wickedness has an open course because of its power, it compels every passion to emerge, producing rage, murder, lust, adultery, and greedy acquisition of public wealth.”
Ἐν μὲν γὰρ τοῖς ἀσθενέσι καὶ ταπεινοῖς καὶ ἰδιώταις τῷ ἀδυνάτῳ μιγνύμενον τὸ ἀνόητον εἰς τὸ ἀναμάρτητον τελευτᾷ, ὥσπερ ἐν ὀνείρασι φαύλοις τις ἀνία τὴν ψυχὴν διαταράττει συνεξαναστῆναι ταῖς ἐπιθυμίαις μὴ δυναμένην· ἡ δ᾿ ἐξουσία παραλαβοῦσα τὴν κακίαν νεῦρα τοῖς πάθεσι προστίθησι· καὶ τὸ τοῦ Διονυσίου ἀληθές ἐστιν· ἔφη γὰρ ἀπολαύειν μάλιστα τῆς ἀρχῆς, ὅταν ταχέως ἃ βούλεται ποιῇ. μέγας οὖν ὁ κίνδυνος βούλεσθαι ἃ μὴ δεῖ τὸν ἃ βούλεται ποιεῖν δυνάμενον· αὐτίκ᾿ ἔπειτά γε μῦθος ἔην, τετέλεστο δὲ ἔργον (Il. 19.242). ὀξὺν ἡ κακία διὰ τῆς ἐξουσίας δρόμον ἔχουσα πᾶν πάθος ἐξωθεῖ, ποιοῦσα τὴν ὀργὴν φόνον τὸν ἔρωτα μοιχείαν τὴν πλεονεξίαν δήμευσιν.
“It is not possible to hide wickedness in power. But, as when someone with vertigo* might go up in a high place and move around, only to become dizzy and uncertain, thus revealing their suffering, so fortune amplifies the untaught and ignorant a little with some wealth, reputation or offices and, once they have risen up, it shows them falling. Or rather, it is the same as when you cannot tell which of some containers is solid and which is cracked but when you pour water into them, the culprit leak is clear: rotten minds cannot manage power, but they ooze out random desires, rages, improprieties, and base manners.”
Οὐδὲ γὰρ λαθεῖν οἷόν τε τὰς κακίας ἐν ταῖς ἐξουσίαις· ἀλλὰ τοὺς μὲν ἐπιληπτικούς, ἂν ἐν ὕψει τινὶ γένωνται καὶ περιενεχθῶσιν, ἴλιγγος ἴσχει καὶ σάλος, ἐξελέγχων τὸ πάθος αὐτῶν, τοὺς δ᾿ ἀπαιδεύτους καὶ ἀμαθεῖς ἡ τύχη μικρὸν ἐκκουφίσασα πλούτοις τισὶν ἢ δόξαις ἢ ἀρχαῖς μετεώρους γενομένους εὐθὺς ἐπιδείκνυσι πίπτοντας· μᾶλλον δ᾿, ὥσπερ τῶν κενῶν ἀγγείων οὐκ ἂν διαγνοίης τὸ ἀκέραιον καὶ πεπονηκός, ἀλλ᾿ ὅταν ἐγχέῃς, φαίνεται τὸ ῥέον· οὕτως αἱ σαθραὶ ψυχαὶ τὰς ἐξουσίας μὴ στέγουσαι ῥέουσιν ἔξω ταῖς ἐπιθυμίαις, ταῖς ὀργαῖς, ταῖς ἀλαζονείαις, ταῖς ἀπειροκαλίαις.
*The original Greek seems to be about people with epilepsy (tous epilêptikous)