The good guys in Harry Potter have a SERIOUS communication problem!! It's one of the things I love about HP; Harry is always completely clueless! lol!
I chose "secrets" that would've really helped Harry if he had known them (that Tom Riddle was Voldemort, that the "secret weapon" was a prophecy and not him, that Dumbledore knew about Draco...) but that people chose to hide from him for reasons passing understanding
(c) J.K. Rowling
People, please stop commenting to tell me that it's "Sorcerer's Stone" and not "Philosopher's Stone". IT'S ONLY CALLED SORCERER'S STONE IN THE AMERICAN EDITION. You can't call yourself a Harry Potter fan and not know that, come on! See for yourselves!.