What's news to me is that people in the present are translating old non-English texts into some older form of English - is that true?
More likely, it's an old translation from the Latin. Many of the translations we have now originate from 150+ years ago.
> This might be why modern people feel so disconnected from past people, even though we're basically identical.
If the original text used what was already considered an archaic or rarefied register at its time of composition (as is often true of various classical works, indeed this is often basically what a "classical language" means), then a translator, in the process of trying to convey the original author's tone and intent, might choose to do the same in the target language.
The original quote with thou and thees that you're curious about instead speaks to the intrinsic motivations being available when the future arrives not resources.
So there is your answer? Meaning is lost in translation so best to stay as true to the original message as possible.
Surely any major human language can accurately capture a translation from any other major human language, even if it requires more words than the original to convey the meaning.
"Never let the future disturb you. You will meet it, if you have to, with the same weapons of reason which today arm you against the present."
In English, thou was the informal, you the formal, as the subject in a sentence, with thee and ye the object form. Hence "God rest ye merry gentlemen" is better translated these days as "God rest you, merry gentlemen".
The T-V distinction is also why the Quakers maintained the thou form for some time, to indicate equality among all men (in the gender-neutral sense of the world), as you implied a difference in status.
The question of why the Bible used thous and thees is another interesting rabbit hole.
https://www.nytimes.com/2019/11/16/opinion/sunday/pronouns-q...
This might be why modern people feel so disconnected from past people, even though we're basically identical.
I connect a lot better with:
> "Forget the future. When and if it comes, you’ll have the same resources to draw on—the same logos"
(from Gregory Hayes translation, if I'm not mistaken)
https://www.amazon.com/Meditations-New-Translation-Marcus-Au...