κρύσταλλος ἐπεπήγει οὐ βέβαιος ἐν αὐτῇ
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
a thin crust of ice had formed in it the trench
