User blog comment:ACursedDoor/Ideas about Eye of Providence and about who wrote the books./@comment-25626066-20120909063120

So here's my theory; The Eye of Providence may be the guardian of Gravity Falls, trying to keep everyone from learning about Gravity Falls' dark side. That may be why he and his hidden eyes watch over the people with the symbols from the opening scene, because they've begun to understand/already know some of the town's secrets. The author may have found out many secrets during his time there, so the Eye of Providence must've sent someone to keep them from revealing the truth; most likely Grunkle Stan, and that would have been why the author hid the books and went into hiding. Dipper has Book 3, Gideon has Book 2, and perhaps Grunkle Stan has Book 1. And that's my theory. :3