the Council affirmed that Christ possesses two natures—a divine nature and a human nature. In this way, the Council underscored that Christ is fully God and at the same time fully human. Second, against Nestorius the Council affirmed that these two natures exist in hypostatic union. That is, the two natures form one “subsistence” or “person.” In this way the Council safeguarded the unity of the person. Third, the Council described this relationship of the divine and the human in Christ by using primarily