ἁπτέον
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)
(ἅπτομαι)
A one must cling to a thing, bestow pains upon it, μουσικῆς Pl.R.377a, cf. Epicur.Fr.461; one must partake of, πλακοῦντος Alex.250, cf. Gal.11.371, Porph.Abst.2.44.
Greek (Liddell-Scott)
ἁπτέον: ῥηματ. ἐπίθ. τοῦ ἅπτομαι, πρέπει τις νὰ ἐπιδοθῇ, νὰ ἀφιερωθῇ εἴς τι, μουσικῆς Πλάτ. Πολ. 377Α· «νὰ βάλῃ χέρι», ν’ ἀρχίσῃ νὰ τρώγῃ, πλακοῦντος Ἄλεξις ἐν «Φιλίσκω» 1.