That the Father and the Son must not be divided That is, in respect of substance or nature, though the Persons must be distinguished. is proved by the words of the Apostle, seeing that it is befitting to the Son that He should be blessed, only Potentate, and immortal, by nature, that is, and not by grace, as even the angels themselves are immortal, and that He should dwell in the unapproachable light. How it is that the Father and the Son are alike and equally said to be “alone.”