Specifically on this really old post... Sorry, But I was just thinking about your comment. If truth was based on belief and everyone had a different truth, then isn't her truth that she knows the only truth the truth and trying to tell her that her truth isn't the only truth But just a truth kinda paradoxical? It's contradictory and tenuous at best. In any case, do you continue correcting her, or let her have her truth?
I, um... I just wanna point out that Celestia isn't the perfect ruler, she has her flaws. Even she knows this, and she has darkness inside her too. She shows this with her demonstration of dark magic.
Actually... I'm pretty sure he's talking about the Crowley's hexagram you related Twilights cutie mark to on your older posts. Also, I think he means the diagrams from the time travel episode... or maybe the ones in the school...