φαιδρότης
From LSJ
μή μοι θεοὺς καλοῦσα βουλεύου κακῶς· πειθαρχία γάρ ἐστι τῆς εὐπραξίας μήτηρ, γυνὴ Σωτῆρος· ὦδ᾽ ἔχει λόγος → When you invoke the gods, do not be ill-advised. For Obedience is the mother of Success, wife of Salvation—as the saying goes.
English (LSJ)
ητος, ἡ,
A brightness, brilliance, ὀφθαλμῶν Poll.6.199; λίθων Lib.Or.11.89, cf. 221. 2 metaph., joyousness, Isoc.15.133, Plu.2.595d.