ἐπισυναπτέον
From LSJ
κακοὶ μάρτυρες ἀνθρώποισιν ὀφθαλμοὶ καὶ ὦτα βαρβάρους ψυχὰς ἐχόντων → eyes and ears are poor witnesses for men if their souls do not understand the language (Heraclitus Phil.: Fr. B 107; Testimonia: Fragment 16, line 6)
English (LSJ)
one must subjoin, S.E.M.10.20.
Greek (Liddell-Scott)
ἐπισυναπτέον: ῥημ. ἐπίθ. τοῦ ἐπισυνάπτω, δεῖ ἐπισυνάπτειν, Σέξτ. Ἐμπ. π. Μ. 10. 20.