Plato, Laws 791b

ἡμῖν διαθέσεων ἕξεις ἔμφρονας ἔχειν. καὶ ταῦτα, ὡς διὰ βραχέων γε οὕτως εἰπεῖν, πιθανὸν λόγον ἔχει τινά. πάνυ μὲν οὖν. εἰ δέ γε οὕτως τοιαύτην τινὰ δύναμιν ἔχει ταῦτα, ἐννοεῖν χρὴ τόδε παρʼ αὑτοῖς, ὡς ἅπασα ψυχὴ δείμασιν συνοῦσα ἐκ νέων μᾶλλον ἂν διὰ φόβων ἐθίζοιτο γίγνεσθαι· τοῦτο δέ που πᾶς ἂν φαίη δειλίας ἄσκησιν ἀλλʼ οὐκ ἀνδρείας γίγνεσθαι. πῶς γὰρ οὔ; τὸ δέ γε ἐναντίον ἀνδρείας ἂν φαῖμεν ἐκ νέων εὐθὺς

they chance to be worshipping with sacrifice. This is—to put it shortly—quite a plausible account of the matter. Most plausible. Seeing, then, that these causes produce the effects described, in the case of the people mentioned one should observe this point,—that every soul that is subjected to fright from youth will be specially liable to become timid: and this, as all would aver, is not to practice courage, but cowardice. Of course it is.