his head, sort of metaphorically, just like you 
might on a ship have a bulkhead, which keeps the 
compartments each sealed and contained so that 
if a torpedo hits one compartment, the entire ship 
won’t sink and the other compartments won’t 
flood. Marshall, in my dealings with him over many 
years, kept his Catholicism separate in that way. 
He did not use a lot of theological scripture, for 
example, to substantiate his academic arguments. 
He did not appeal to religious nomenclature for the 
most part, in an academic lesson. He sought to 
keep the two separate and in a professional way, 
and also in a way that would keep him from 
experiencing cognitive dissonance, because in the