μὴ κακὸν εὖ ἔρξῃς· σπείρειν ἴσον ἔστ' ἐνὶ πόντῳ → do no good to a bad man; it is like sowing in the sea
Gutta: ae, m.,I a Roman surname, Cic. Clu. 26, 71; 36, 98.