Notes from Wikiquote
ἔστιν γάρ, ἔστιν ἁπάσης ἀρετῆς ἀρχὴ μὲν σύνεσις, πέρας δ᾿ ἀνδρεία. | For of all virtue, I say, and I repeat it, the beginning is understanding and the fulfilment is courage. (tr. N. W. DeWitt, N. J. DeWitt, 1949) | The corrupt form appears to be misremembered from a rendering of this passage in John Florio's translation of Montaigne's essays (The Essayes . . . of Lo: Michaell de Montaigne, London, 1603, p. 194) | It is a saying of Demosthenes, (as some report,) That consultation and deliberation, is the beginning of all vertues, and constancie, the end and perfection. | First appears in print in the July 1824 issue of The European Magazine (vol. 86, p. 29), attributed to Demosthenes.