πιστευτέον
From LSJ
πάντα χωρεῖ καὶ οὐδὲν μένει καὶ δὶς ἐς τὸν αὐτὸν ποταμὸν οὐκ ἂν ἐμβαίης → all things move and nothing remains still, and you cannot step twice into the same stream
English (LSJ)
A one must trust, Pl.Ti.20b, 40e, Arist.GA760b31, Str.15.1.34. II one must believe, Plb.12.11.3, Str.1.3.1 ; τῷ θρυλουμένῳ Longin.44.2 ; εἰ τοῦτο π. κατ' ἐκείνου Aristid.Or.20(21).9 : in pl. -ευτέα, οὐκέτι π. τῶν νῦν οὐδενί Luc.Tim.48.
