This work from the late Empire attributed to Emperor Justinian, emphasizes the importance of unity in the Christian faith, particularly regarding the nature of God and the person of Jesus Christ. It articulates a clear stance against heretical views such as Sabellianism and Arianism, affirming the doctrine of the Trinity as one God in three persons: the Father, the Son, and the Holy Spirit. The text also elaborates on the incarnation of Jesus, asserting that He is both fully divine and fully human, capable of suffering and performing miracles, thus reinforcing the belief that faith should be placed in the Word of God.