B. Councils and Creeds
Clarification of this deposit became necessary when interpretations of the Christian message arose that were deemed to be deviations from these norms. The most important deviations, or heresies (see Heresy), had to do with the person of Christ. Some theologians sought to protect his holiness by denying that his humanity was like that of other human beings; others sought to protect the monotheistic faith by making Christ a lesser divine being than God the Father.
In response to both of these tendencies, early creeds began the process of specifying the divine in Christ, both in relation to the divine in the Father and in relation to the human in Christ. The definitive formulations of these relations came in a series of official church councils during the 4th and 5th centuries—notably the one at Nicaea in 325 and the one at Chalcedon in 451—which stated the doctrines of the Trinity and of the two natures of Christ in the form still accepted by most Christians (see Chalcedon, Council of; Nicene Creed). To arrive at these formulations, Christianity had to refine its thought and language, creating in the process a philosophical theology, both in Greek and in Latin, that was to be the dominant intellectual system of Europe for more than a thousand years. The principal architect of Western theology was Saint Augustine of Hippo, whose literary output, including the classic Confessions and The City of God, did more than any other body of writings, except for the Bible itself, to shape that system.
First, however, Christianity had to settle its relation to the political order. As a Jewish sect, the primitive Christian church shared the status of Judaism in the Roman Empire, but before the death of Emperor Nero in 68 it had already been singled out as an enemy. The grounds for hostility to the Christians were not always the same, and often opposition and persecution were localized. The loyalty of Christians to “Jesus as Lord,” however, was irreconcilable with the worship of the Roman emperor as “Lord,” and those emperors, such as Trajan and Marcus Aurelius, who were the most deeply committed to unity and reform were also the ones who recognized the Christians as a threat to those goals and who therefore undertook to eliminate the threat. As in the history of other religions, especially Islam, opposition produced the exact contrary of its intended purpose, and, in the epigram of the North African church father Tertullian, the “blood of the martyrs” became the “seed of the church.” By the beginning of the 4th century, Christianity had grown so much in size and in strength that it had to be either eradicated or accepted. Emperor Diocletian tried to do the first and failed; Constantine the Great did the second and created a Christian empire.
D. Official Acceptance
The conversion of Constantine the Great assured the church a privileged place in society, and it became easier to be a Christian than not to be one. As a result, Christians began to feel that standards of Christian conduct were being lowered and that the only way to obey the moral imperatives of Christ was to flee the world (and the church that was in the world, perhaps even of the world) and to follow the full-time profession of Christian discipline as a monk. From its early beginnings in the Egyptian desert, with the hermit St. Anthony, Christian monasticism spread to many parts of the Christian empire during the 4th and 5th centuries. Not only in Greek and Latin portions of the empire, but even beyond its eastern borders, far into Asia, Christian monks devoted themselves to prayer, asceticism, and service. They were to become, during the Byzantine and medieval periods, the most powerful single force in the Christianization of nonbelievers, in the renewal of worship and preaching, and (despite the anti-intellectualism that repeatedly asserted itself in their midst) in theology and scholarship. Most Christians today owe their Christianity ultimately to the work of monks. See also Religious Orders and Communities.