ἀποτειχιστέον
From LSJ
περὶ οὐδὲν γὰρ οὕτως ὑπάρχει τῶν ἀνθρωπίνων ἔργων βεβαιότης ὡς περὶ τὰς ἐνεργείας τὰς κατ' ἀρετήν → since none of man's functions possess the quality of permanence so fully as the activities in conformity with virtue
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.
Spanish (DGE)
hay que separar por un muro fig. αὐτήν (διαβολήν) Them.Or.22.278a.