John Henry Cardinal Newman, "Arians of the Fourth Century"
Part 14: Chapter IV. Synods during the reign of Constantius ; Semiarians
After the Council of Sardica (ca. 343), deep tensions emerged within the Church between East and West. There was no fundamental difference in faith and doctrine between the majority of the bishops of the East and West. Rather, it was political circumstances, manipulation, and a lack of prudence on the part of a significant portion of the clergy that led to the split. The Eusebians, an influential Arian party familiar with court politics and capable of imposing their own narrative, were able to exploit the passivity of many orthodox bishops. Many of them, especially in the East, did not attend the Council of Sardica: some out of fear of reprisals, others out of convenience or a lack of responsibility. In this way, the voice of the Eastern Church was placed in the hands of people whom the orthodox themselves, in other circumstances, condemned as uncatholic.
A false, orchestrated rift was created. As a consequence of this situation, the seminarian movement came to the fore: a group of clergy who had previously remained in the shadow of the Eusebians, and whose doctrine fell somewhere between orthodoxy and Arianism. The seminarians held a view seemingly close to the teachings of the Church, which made them dangerous opponents, especially for the West, less skilled in recognizing the subtle distinctions of Greek theology. According to Newman, the origins of semi-Arianism are almost ironic. The Eusebians, masters of ambiguous formulas and theological evasions, created various creeds not to express any real doctrine but to avoid accepting the Nicene homoousios and to appease Western opinion. It was a tactic, a play on words. However, they did not foresee that some of their own disciples took these formulas deadly seriously and began to build a theological system upon them.
And thus, from the Eusebians' opportunism, a new form of heresy was born, sophisticated and seemingly profound, yet at the same time rife with internal contradictions.
The most telling example of this attitude was the Emperor Constantius himself. Constantius was a man of an unstable, hypersensitive nature, prone to intellectual restlessness. He seemed always on the verge of orthodoxy, but he could never quite accept it; he always harbored some subtle reservation about it, some philosophical "but." At the same time, he was full of pride and a tendency toward tyranny, which caused him to change his position as rapidly as he fell into new doubts. He was capable of exiling his former associates simply because they no longer corresponded to his new theological subtleties. Moreover, what distinguished him was his ability to persecute almost all sides of a dispute and never found peace in any doctrine except the one that was true: homoousios.
Semiarian doctrine
The most important concept for the Semiarians was homoiousios, "similar in substance." It was an alternative to the Nicene homoousios ("consubstantial"), which raised two kinds of concerns among them: first, Sabellianism (if "substance" means "individual being," then homoousios suggests that the Father and Son are a single hypostasis), and second, material equality (if "substance" means a nature common to many beings, this might suggest that the Godhead is a common nature, like a species). These "fears" of the semiarians were not errors in the sense of heresy, but rather symptoms of mental insecurity: a failure to distinguish between the language of philosophy and the language of theology. In practice, however, their own formulations were far more contradictory than those they feared.
The semiarians said that the Son was begotten of the substance of the Father, but not consubstantial with that substance; that he was eternal in the sense of being born "outside of time," but not eternal in the absolute sense; that he was truly the Son, but not fully God like the Father; that he was a perfect image, but not equal.
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