ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
adj.
Orderly: P. and V. κόσμιος, εὔκοσμος.
Constant: Ar. and P. συχνός.
