ἀποτειχιστέον
From LSJ
ἕτερος ἐξ ἑτέρου σοφός τό τε πάλαι τό τε νῦν → one gets his skill from another, now as in days of old
English (LSJ)
A one must wall off: metaph., διαβολήν Them.Or.22.278a.
Greek (Liddell-Scott)
ἀποτειχιστέον: ῥηματ. ἐπίθ., πρέπει τις διὰ τειχῶν νὰ ἀποκλείσῃ, ἀποχωρίσῃ, νὰ ἐμποδίσῃ, μεταφ., διαβολὴν Θεμίστ. 278Α.