ἀνοικτέον
From LSJ
ἁρμονίη ἀφανὴς φανερῆς κρείττων → the hidden attunement is better than the obvious one, invisible connection is stronger than visible, harmony we can't see is stronger than harmony we can, unseen harmony is stronger than what we can see
English (LSJ)
A one must open, E.Ion1387.
Greek (Liddell-Scott)
ἀνοικτέον: ῥημ. ἐπίθ. τοῦ ἀνοίγω, πρέπει τις νὰ ἀνοίξῃ, Εὐρ. Ἴων 1387.
Spanish (DGE)
hay que abrir τάδ' E.Io 1387.
Greek Monotonic
ἀνοικτέον: ρημ. επίθ. του ἀνοίγω, αυτό που πρέπει να ανοιχθεί, σε Ευρ.
Russian (Dvoretsky)
ἀνοικτέον: adj. verb. к ἀνοίγω.