κοινὴ γὰρ ἡ τύχη καὶ τὸ μέλλον ἀόρατον → fortune is common to all, the future is unknown | fortune is common to all and the future unknown | fate is common to all and the future unknown
τετραπλοῦν: τό вчетверо большее количество, четверная сумма или доля Xen., NT.