ἐν ῥοπῇ κεῖσθαι
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
Greek > English (Woodhouse)
be at a crisis, be at hazard, be in danger, be in jeopardy, hang by a thread, lie in the balance