§27.20.1ἴσως μὲν οὖν ἐν πᾶσι τοῖς ἀνθρωπείοις τῷ καιρῷ δεῖ μετρεῖν ἕκαστα τῶν ἐνεργουμένων· μεγίστην γὰρ οὗτος ἔχει δύναμιν· μάλιστα δʼ ἐν τοῖς πολεμικοῖς·
Perhaps, then, in all human affairs, one must measure each of the actions being performed by the opportunity; for this has the greatest power, and especially in military affairs.
§27.20.2ὀξύταται γὰρ περὶ τούτων εἰς ἑκάτερα τὰ μέρη γίνονται ῥοπαί· τὸ δʼ ἀστοχεῖν τούτων μέγιστόν ἐστι τῶν ἁμαρτημάτων. — §27.20.3ὅτι δοκοῦσι πολλοὶ μὲν τῶν ἀνθρώπων ἐπιθυμεῖν τῶν καλῶν, ὀλίγοι δὲ τολμᾶν ἐγχειρεῖν αὐτοῖς, σπάνιοι δὲ τῶν ἐγχειρησάντων ἐπὶ τέλος ἀγαγεῖν τὰ πρὸς τὸ καθῆκον ἐν ἑκάστοις ποιούμενα.
For in these matters, the swiftest turns of the scale occur toward either side; and to miss these is the greatest of errors. — That many men seem to desire noble things, but few dare to undertake them, and rare among those who have undertaken them are those who bring to completion the things done in accordance with duty in each case.