τὸν δάκτυλον ἀλγεῖν
From LSJ
ἀρχὴ παιδεύσεως ἡ τῶν ὀνομάτων ἐπίσκεψις → the beginning of education is the examination of names, the beginning of philosophical education is the examination of names, the beginning of all education is the investigation of names