συνεπλάκημεν, i.e. against Eunomius, in defence of the equality of the Trinity in the Baptismal symbol. Often as Gregory in that treatise opposes Eunomius for placing the essence of Christianity in mere γνῶσις and δογμάτων ἀκρίβεια, as against God’s incomprehensibility, and knowledge only by the heart, he had yet spent his whole life in showing the supreme importance of accuracy in the formulas upon which the Faith rested. This helps to give a date for the Great Catechism.