μὴ κακὸν εὖ ἔρξῃς· σπείρειν ἴσον ἔστ' ἐνὶ πόντῳ → do no good to a bad man; it is like sowing in the sea
adj.
P. and V. θαυμαστός, δεινός, ἀμήχανος, Ar. and P. θαυμαστος, ὑπερφυής, V. ἔκπαγλος.