Indeed, Latvian is a somewhat formalized version of Latgalian, so I'm not sure how that can be "truth worth discovery [sic]". If you haven't kept up with news back home, it might be of interest to you that there are MPs in the Parliament that are delivering their swear-in ceremony speeches in Latgalian now. More power to them. The rest of your comment, however, is a non sequitur.