St. AthanasiusSt. Athanasius, detail of a 12th-century mosaic; in the Palatine Chapel, Palermo, Italy. The lingering disagreements about which Christological model was to be considered normative burst into the open in the early 4th century in what became known as the Arian controversy, possibly the most-intense and most-consequential theological dispute in early Christianity. The two protagonists, Arius (c. 250–336) and Athanasius (c. 293–373), differed over matters of theology but were quite similar in temperament and personality—learned, self-confident, and unyielding. Both were from Alexandria, Arius a distinguished churchman and scholar and Athanasius a brilliant theologian.
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| | Arius | Biography, Beliefs, & FactsArius, Christian priest whose teachings gave rise to a theological doctrine known as Arianism. The doctrine was ... |
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Arius’s Christology was a mixture of adoptionism and logos theology. His basic notion was that the Son came into being through the will of the Father; the Son, therefore, had a beginning. Although the Son was before all eternity, he was not eternal, and Father and Son were not of the same essence. In Jesus, who suffered pain and wept, the logos became human. | | Logos | Definition, History, & FactsLogos, in Greek philosophy and early Christian theology, the divine reason implicit in the cosmos, ordering it a... |
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| | Jesus | Facts, Teachings, Miracles, Death, & DoctrinesJesus of Nazareth, a historical figure revered by Christians as the Son of God, is known for his profound teachi... |
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One strength of Arius’s position was that it appeared to safeguard a strict monotheism while offering an interpretation of the language of the New Testament—notably, the word Son—that conformed to general usage and meaning. The weakness of his view was that, precisely because Jesus was capable of suffering as a human, it was difficult to understand how he could be fully divine and thus effect the redemption of humankind. | | Safeguard Definition & Meaning | Britannica DictionarySAFEGUARD meaning: something that provides protection against possible loss, damage, etc. |
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According to Athanasius, God had to become human so that humans could become divine. Thus, at the heart of Athanasius’s Christology was a religious rather than a speculative concern. That led him to conclude that the divine nature in Jesus was identical to that of the Father and that Father and Son have the same substance. He insisted on the need for the Nicene homoousios to express the Son’s unity with the Father. 
The controversy did more than severely agitate and bitterly divide the Christian community; it also threatened the political stability of the Roman Empire. Eager for a resolution, Emperor Constantine convened and presided over the Council of Nicaea, which formulated the Nicene Creed, affirming the Athanasian position. Constantine, according to his biographer Eusebius of Caesarea, had sought to achieve a rapprochement between the two sides by suggesting the use of the word homoousios, which was accepted by all in attendance with the exception of Arius and two Libyan bishops. The Western bishops, who like most of the bishops in attendance had not given much thought to the issue, were not troubled by Constantine’s term, which they understood as equivalent to the Latin word substantia, which Tertullian had used to describe the two substances of Jesus.
