[Staff edit].
I must admit that the disrespect which is being paid to great Christian teachers and leaders from history in this thread is as audacious as it is disturbing.
In a great many cases, the Early Church Fathers risked their lives to be Christians. They carefully studied the scriptures, they prayed without ceasing, many of them died agonizing martyr's deaths for their faith and, in the bargain, they ferreted out heresy wherever they found it.
For example, there were numerous debates and disputes over the nature of the Incarnation. And the reason for that is because it's not incidental doctrine. Understanding the Incarnation leads to an understanding of Our Lord's character, mission and redemptive work. Understanding those things leads to an understanding of the grace we have been offered.
It's quite easy for someone today to look at careful study of theology, Christology, soteriology, etc, with something akin to disdain. But for Christians earlier in history who didn't have the benefit of nearly two full millennia of orthodox faith and exegesis to depend upon, these were not incidental matters. Indeed, they cut to the heart of the faith that was still growing and maturing in their time.
[Staff edit].