Except it doesn't work if you are Jewish - no matter what language is spoken in your country, the bible is always written in Hebrew.That method was apparently how 19th century people would become multilingual.
They'd buy a book on grammar for the new language (he doesn't need one since he already speaks it) and then a bible of their religion in the new language (since they know it by heart, and even if not then the translators will usually be very careful with religious texts, so they can cross reference easily) and then they'd learn (to read) the new language pretty fast.
Well, that leaves you not knowing it by heart, but you can still buy a protestant bible in your native and the new language. (As well as maybe Tolkien or Harry Potter or smth - not as perfect or easy, but the base principle remains solid)Except it doesn't work if you are Jewish - no matter what language is spoken in your country, the bible is always written in Hebrew.
It also means that as a merchant, you don't NEED to learn another language, as you have people who speak your language all over.Well, that leaves you not knowing it by heart, but you can still buy a protestant bible in your native and the new language. (As well as maybe Tolkien or Harry Potter or smth - not as perfect or easy, but the base principle remains solid)
It could be that he is from the "ancient civilization"surprised no 'isekai' tag if he has memories of a past life versus just reincarnation as opposed to him being in the same world and just reincarnating where it's the same inventions/not as advanced or so