Laudator Temporis Acti

Dionysius of Halicarnassus, Roman Antiquities 8.26.6 (tr. Earnest Cary):

Courage in the face of danger is not apt to be felt in equal measure by those who fight for their own blessings and by those who set out after what belongs to others. For the latter, if they do not succeed, suffer no loss, whereas the others, if they are defeated, have nothing left. And this is the chief reason why large armies have often been beaten by smaller ones and superior forces by inferior ones. For necessity is formidable, and a struggle in which life itself is at stake is capable of inspiring boldness in a man which was not already his by nature.

τὸ παρὰ τὰ δεινὰ εὔτολμον οὐκ ἐξ ἴσου παραγίνεσθαι φιλεῖ τοῖς θ' ὑπὲρ οἰκείων ἀγαθῶν ἀγωνιζομένοις καὶ τοῖς ἐπὶ τἀλλότρια πορευομένοις· οἱ μέν γ' οὐδέν, ἐὰν μὴ κατορθώσωσι, βλάπτονται, τοῖς δ' οὐδέν, ἐὰν πταίσωσι, καταλείπεται· καὶ τοῦ σφάλλεσθαι τὰς μεγάλας δυνάμεις ὑπὸ τῶν ἐλαττόνων καὶ τὰς κρείττους ὑπὸ τῶν φαυλοτέρων τοῦτ' ἐν τοῖς μάλιστ' αἴτιον ἦν. δεινὴ γὰρ ἡ ἀνάγκη, καὶ ὁ περὶ τῶν ἐσχάτων κίνδυνος ἱκανὸς θάρσος ἐνθεῖναί τινι καὶ μὴ προϋπάρχον φύσει.