Working on a talk this week for a Christology course, I am reading up on Arius, taking up the modern master, Professor Rowan Williams and his book Arius: Heresy and Tradition. A post or two will flow from this work. In the meantime, here is a thought: reason in Anglican terms does not stand alone or apart from Scripture and tradition. What are Scripture and tradition in relation to truth? They are revelation (God speaking to us) combined with accumulating reason in which the church clarifies what it is hearing from God, using minds created by God and renewed by the Spirit (Romans 12:1-2). In sum, the trifecta Scripture, tradition and reason are a duality, revelation and reason.
What was going on in the Arian controversy? The church was reasoning its way to the truth revealed to it. Arian took a line of reasoning which the church judged to be false, both in the light of reason (Arian's logic re the Logos was faulty) and in respect of revelation. The history of Nicea through to Chalcedon is a lesson in revelation and reason being held together, each informing the other, the conclusion reached being impossible without revelation. The key to knowing that the reasoning of the church led in the right direction is that revelation was coherent with the outcome.
You may or may not see where this is heading if we fast forward to our time and our troubles. More later.