If you want to assure that no other mortal being snoops upon your spells and incantations , let this Victorian priest scare them out of their prying ways and straight into the nearest insane asylum. But one of those really bad kind from the same era as Tentacle Priest . And then you can visit them, like, once every two years, and bring them a cake that you baked out of dirt and cement. You can just make up crazy stuff about what everyone's saying about them outside.
You can say that they have CCTV cameras everywhere, trained on them every minute of every day, broadcasting every single minute of their crazy, snoopy lives on the internet, where literally hundreds of thousands of people just talk smack about them constantly. Because Victorian Loony-Bins don't have the internet. They've never even heard of computers. Because they're old and stupid.
I'm a bizarro author who bounces around the world, most recently in a custom 1985 van. I like dogs (LOVE mine), peanut butter, outside, being the different one that everyone talks a bunch of smack about because they don't usually understand me, and searching for ancient ruins in any forest I find myself.