“Once He was not (῏Ην ποτε ὅτε οὐκ ἦν).  This famous Arian formula is expressly rejected in Cat. xi. § 17:  “Neither let us say, There was a time when the Son was not.”  The eternity of the Son is asserted again and again, in reference, for instance, to His generation Cat. iv. § 7., His Priesthood Ib. x. § 14., and His throne Ib. xiv. § 27..