Yeah, I had gone and looked at the French for "doesn't come from there, but from another part," and I concluded I have no idea what he's talking about. I wonder if it's time to grab my native speaker friend for consulting services again.

And yes, the "either morality or heroism" gave me pause for the reason you mention, but I *think* I would still take it as referring to Stoicism rather than conventional morality, just because it's such a common trope in Fritz's letters. And redundancy in the form of parallel clauses is a stylistic device in both the Bible and Roman literature (Cicero is *all over* it), and all their imitators since. Your interpretation isn't impossible, though!

This is definitely a crux.