This is actually a grammatical thing. If you quote a quote but something is not on it so on…
It looks like this
“God so love the world…”
John 3:16
Ir is a universal thing in the English language that can be used in citing sources. Older language has longer so on so to speak. It is known so on lines so to speak. Like almost any Christian would know the rest of this quote.
It is more common in research then you think care to scan though all the ligature… or the English language… perhaps some power you rent maybe useful for commonalities. Who knows what maybe found.
Hell of an idea…