ἀγνοητέον
From LSJ
ζηλοῦτε δὲ τὰ χαρίσματα τὰ μείζονα. Καὶ ἔτι καθ᾽ ὑπερβολὴν ὁδὸν ὑμῖν δείκνυμι (1 Corinthians 12:31) → But go ahead and strive for the greater gifts. And I'm about to show you a still more excellent way.
English (LSJ)
with neg., οὐκ ἀ. A one must not fail to remark, Dsc.Praef.7, Ph.1.11, al.
Greek (Liddell-Scott)
ἀγνοητέον: ῥημ. ἐπίθ., μετ ̓ ἀρνήσ. οὐκ ἀγνοητέον, δὲν πρέπει νὰ ἀγνοῇ τις, Διοσκορ. προοίμ. Ι. Φίλων.
Spanish (DGE)
hay que ignorar en litotes οὐχ ἀ. no se debe dejar de observar Ph.1.11, Dsc.praef.7, Asp.in EN 67.30, Didym.in Zach.4.30, Socr.Sch.HE 2.20.14.