So you’re thinking about a quote from Pratchett…

…which brings to mind and makes you look up Falstaff.

This makes you look up John Oldcastle.

This makes you look up Lollardy.

This makes you look up Consubstantiation (which you know a little about) versus Transubstantiation (which you know more about).

And then – back to John Oldcastle – you look up Heresy.

At the end of it you decide two things:

1. Religion is a history of people taking trifling differences far too seriously
2. The religious also seem to have problems with metaphor (see point 1)