No, you're the one that's doing that.
I've already said "I don't necessarily think it 'comes from' anywhere" twice now.
Maybe if I rephrase you'll understand where I'm coming from:
"I have no reason to believe it 'originated' anywhere."
Okay, prove it.
The idea that "all men will die" is based on experience. 10 out of 10 die.
As for "absolutes", that's not a concept I put much stock in. No one that I know of -outside of religion- deals in absolutes (except maybe the Sith
). There are ideas that we can be fairly certain of, but claiming that something is "absolute" is never wise.
I explained this in an earlier post.