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. and V. αὐτουργός, ὁ, ἐργάτης, ὁ, Ar. and P. γεωργός, ὁ, V. γῄτης, ὁ, γαπόνος, ὁ.