φάσθαι
From LSJ
θεωρεῖται δὲ ἀνοησίᾳ κρείττονι νοήσεως → it is grasped only by means of an ignorance superior to intellection, it may be immediately cognised only by means of a non-intellection superior to intellection
English (LSJ)
inf. pres. Med. of φημί, Il.1.187, Od.11.443.
Greek (Liddell-Scott)
φάσθαι: ἀπαρέμφ. μέσ. ἐνεστ. τοῦ φημί, Ἰλ. Α. 187, Ὀδ. Λ. 443.