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
P. μανικῶς, ἐμπλήκτως; foolishly, intensely.
impetuously: P. προπετῶς, ἰταμῶς, Ar. and P. νεανικῶς.