Philo Judaeus De Posteritate Caini 94

For it is always the case that if a second impression is stamped upon any thing, the mark of any previous one is effaced. But the impression which is thus made is so far from permitting evil things to be taken in exchange for what is good, that it does not allow even what is beautiful to be taken in exchange for what is laborious; but looking upon what is laborious ( πονηρόν) as evil, since it would be downright folly not to discard what is bad for the sake of the acquisition of what is better, but only taking ( πονηρός) to be equivalent to ἐπίπονος or καματηός, in which sense, indeed, the Attic writers use the word when they mark the first syllable with an acute, thus, πόνηρος.