σπευστέον
From LSJ
Περὶ τοῦ ἐπέκεινα τοῦ νοῦ κατὰ μὲν νόησιν πολλὰ λέγεται, θεωρεῖται δὲ ἀνοησίᾳ κρείττονι νοήσεως → On the subject of that which is beyond intellect, many statements are made on the basis of intellection, but it may be immediately cognised only by means of a non-intellection superior to intellection
English (LSJ)
A one must hasten, Ar.Lys.320, Plb.4.30.5.
Greek (Liddell-Scott)
σπευστέον: ῥηματ. ἐπίθετ., πρέπει τις νὰ σπεύσῃ, Ἀριστοφ. Λυσ. 320, Πολύβ. 4. 30, 5.