I was editing some text for an open source math book today, and came across this sentence:
The previous 8 axioms have basically said "these numbers are all natural numbers." This next and final axiom states "these numbers are all of the natural numbers."
I was going to suggest putting a comma after the words 'said' and 'states', because of the normal usage in dialog. But this isn't really dialog, and it doesn't really seem like it should require the slight pause that the comma indicates. What's the convention here?