ἀποιστέον
From LSJ
ὃν οὐ τύπτει λόγος οὐδὲ ῥάβδος → if words don't get through, neither a beating will | if the carrot doesn't work, the stick will not work either | whom words do not strike, neither does the rod
English (LSJ)
A perferendum, Gloss.
Greek (Liddell-Scott)
ἀποιστέον: ῥηματ. ἐπίθ. τοῦ ἀποφέρω, πρέπει τις νὰ ἀποφέρῃ, ἀποκομίσῃ, ἀφαιρέσῃ, Γλωσσ.