As joked about in TUC (you can't really appreciate Shakespeare until you've read him in the original Klingon), the same is true of many other more ancient texts. Nobody ever said Latin was required
at Starfleet, but I think that if you want to read Pliny and Cicero, and understand all the nuances, it would be good to do so. Ditto "attic Greek" and the New Testament.
In other (apropos) words, if you want to best appreciate ancient literature, you need to understand the language the authors wrote in. No, probably not essential for a starship commander, but it goes well with Picard's interest in archeology (or more accurately, anthropology).