Part 3
Even Protestant denominations that cling rigidly to "sola scriptura" tend, de facto, to accept the products of those Councils and Creeds without acknowledging their source as post-scriptural. 

On the other hand, as Mike AA points out, these creeds themselves are the product of theological evolution beyond scripture, and thus not exactly "constant teaching." Since it is the victors who get to right history, considerable intellectual effort is required to grasp that the Arians argued just as cogently as the Athanasians from scripture to defend their Christologies. 

BTW, I sometimes wonder if best way to understand our traditionalist friends in this forum would be to know more about their education in the faith. After all, clerics trained in manual theology really could not do anything more in catechism classes then convey their own conviction of constancy.