|Athanasius of Alexandria - Wikipedia|
In his denial of the deity of Christ, Arius was arguably the most notorious heretic of the early church.
Though Arius’s heretical views were soundly condemned by the Council of Nicaea (in A.D. 325), the controversy he sparked raged for another fifty years throughout the Roman Empire. During those tumultuous decades, the defenders of Trinitarian orthodoxy often found themselves outnumbered and out of favor with the imperial court. Yet they refused to compromise.
Among them, most famously, stood Athanasius of Alexandria—exiled on five different occasions for his unwavering commitment to the truth. He was joined by the Cappadocian Fathers: Basil of Caesarea, Gregory of Nazianzas, and Gregory of Nyssa.
But how did these early Christian leaders know that the doctrine they were defending was, in fact, a truth worth fighting for? How did they know they were right and the Arians were wrong? Was it on the basis of oral tradition, a previous church council, or an edict from the bishop of Rome?
No. They ultimately defended the truth by appealing to the Scriptures.