νᾶφε καὶ μέμνασ' ἀπιστεῖν → keep a clear head and remember not to believe a thing (Epicharmus fr. 250)
-ονvalioso προσήκει δὲ τὸ φυλάττον τοῦ κτηθέντος ἀξιοτιμότερον εἶναι X.Ep.2, cf. Nic.Dam.Vit.Caes.5, App.BC 3.19.