Plato, Laws 934a

σωφρονιστύος ἕνεκα συνεπομένην προσεκτεισάτω, ὁ μὲν ἀνοίᾳ κακουργήσας ἀλλοτρίᾳ, πειθοῖ διὰ νεότητα ἤ τι τοιοῦτον χρησάμενος, ἐλαφροτέραν, ὁ δὲ διὰ οἰκείαν ἄνοιαν ἢ διʼ ἀκράτειαν ἡδονῶν ἢ λυπῶν, ἐν φόβοις δειλίας ἤ τισιν ἐπιθυμίαις ἢ φθόνοις ἢ θυμοῖς δυσιάτοις γιγνόμενος, βαρυτέραν, οὐχ ἕνεκα τοῦ κακουργῆσαι διδοὺς τὴν δίκην—οὐ γὰρ τὸ γεγονὸς ἀγένητον ἔσται ποτέ—τοῦ δʼ εἰς τὸν αὖθις ἕνεκα

by way of corrective. The penalty shall be lighter in the case of one who has done wrong owing to another’s folly—the wrong-doer being over-persuaded because of his youth or for some such reason; and it shall be heavier when man has done wrong owing to his own folly, because of his incontinence in respect of pleasures and pains and the overpowering influence of craven fears or of incurable desires, envies and rages. And he shall pay the penalty, not because of the wrongdoing,—for what is done can never be undone,—but in order that for the future both he himself and those who behold his punishment may either utterly loathe his sin