/lit/ - Literature

i know this thread is about japanese specifically, but im wondering what language(s) would be best to learn for reading non fiction/philosophical/historical/religious pieces of work
I've studied many different languages but haven't used the majority of them outside of /int/, other socialization websites, and occasional online games so my vocab is mostly slang, video game termonology, and slightly above conversational level topics.

the answer can be japanese, but any other answer with reasoning would be very welcome. thinking russian, latin, greek, french, msa arabic and/or hindi
it would be very easy to start Japanese or Russian because I own quite a few language learning books in them and I've got a foundation in Russian already