Truth is inherently relative. Knowledge can be rational and true, but often times it is only rational, only true, or neither. We can know things and be illogical in explaining why that is the case. Case in point, Catholicism is a reason behind the Roman empire becoming the Holy Roman Empire and lasted however many more centuries. I'm a philosopher, not a classicist, I'm sure there are weebs who'd be willing to correct my anachronisms.
In this chapter, the bishop represents a genuine truth. Catholic philosophy helped reseal the cracks of a dying nation, and it absolutely was a force for good, however the reasoning behind the knowledge of Catholicism's benefits was flawed. This led to a corruption of ethics and the horrors of inquisitors. This chapter tacitly asks you to question dogma.