It is strange that we sort the wheat from the chaff and the unfit from the fit in war, but we do not excuse evil men from the service of the state.

[ἄτοπον ἔφη τοῦ μὲν σίτου τὰς αἴρας ἐκλέγειν καὶ ἐν τῷ πολέμῳ τοὺς ἀχρείους, ἐν δὲ πολιτείᾳ τοὺς πονηροὺς μὴ παραιτεῖσθαι]

Antisthenes (c. 445 - c. 365 BC) Greek Cynic philosopher
Fragment 104 [tr. Laurén]
    (Source)

In Diogenes Laertius, Lives of the Eminent Philosophers, Book 6, ch. 1.

Alt. trans.:

• "He used to say that it is strange that we sift out the chaff from the wheat and those useless for war, but we do not forbid scoundrels in politics." [@sentantiq (3 Jun 2020)]
• "He used to say that it was strange that we separate the wheat from the chaff, the useless in war, but we do not ban wicked men from public life." [@sentantiq (21 Feb 2017)]
• "That it seemed very absurd to separate the chaff from the wHeat, to discharge a coward from the army, and not to extrude the envious from the state." [Source (1753)]
• "'It is strange,' said he, 'that we weed out the darnel from the corn and the unfit in war, but do not excuse evil men from the service of the state.'" [Loeb Classical (1925)]