Spock was a scholarly individual. If he knew he would be spending a lot of time with humans, It wouldn't surprise me if he made a point of studying the roots of current (to him) human culture -- especially the Western human culture -- that we mostly see in all Star Trek, and not just TOS.THIS proves that TOS didn't care too much about the in-universe lore.
Because how can Spock have high enough opinion of the bible to quote it? He is a vulcan, Surak logic is their only religion. I was raised as a catholic and I read the bible, I even attended christian classes at school, but since I dropped my religion I can't think of any famous verse from those books beside the ones that I needed to understand Neon Genesis Evangelion lore
And those roots certainly would include the bible, even if Judeo-Christian faiths are less of a thing by the 23rd and 24th centuries.
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