The confession that Jesus is the Christ, Son of the living God, first ventured by Peter at Caesarea Philippi (Mt 16:16
), is the heart of the Christian faith. This confession makes one a Christian, and all Christian theology is thinking in the light of this confession. The first major theological decision of the church resulting from such believing thought was the affirmation of the essential deity of Jesus as the Son of God. As such he was declared to be of one essence with the Father and the Spirit (the dogma of the Trinity promulgated at Nicaea, AD 325).