The omen on the magic mirror: Eris Strauhru Ayité Ubikafru Ayité Onvos

At first, it was because Dumbledore didn't want others to find out, because people would waste time in front of it, be obsessed with what they saw, and even be driven crazy, because they didn't know whether everything in the mirror was true or possible. Later, Harry found the philosopher's stone in the mirror, because Dumbledore knew that only those who wanted to find it but didn't use it were the ones who really wanted to protect it, so he put it in the mirror. . .