Now as you know, each and every one of you was searched upon your arrival here tonight and you have the right to know why. Once there was a young man, who like you, sat in this very hall, walked this castle's corridors, slept under its roofs. He seemed to all the world a student like any other. His name: Tom Riddle. [Murmuring erupts among the students] Today, of course, he's known all over the world by another name, which is why, as I stand looking out upon you all tonight, I'm reminded of a sobering fact: Every day, every hour, this very minute, perhaps, dark forces attempt to penetrate this castle's walls. [pause] But in the end, their greatest weapon... is you. There's something to think about. Now off to bed, pip pip.
Now as you know, each and every one of you was searched upon your arrival here tonight and you have the right to know why. Once there was a young man, who like you, sat in this very hall, walked this castle's corridors, slept under its roofs. He seemed to all the world a student like any other. His name: Tom Riddle . [Murmuring erupts among the students] Today, of course, he's known all over the world by another name, which is why, as I stand looking out upon you all tonight, I'm reminded of a sobering fact: Every day, every hour, this very minute, perhaps, dark forces attempt to penetrate this castle's walls. [pause] But in the end, their greatest weapon... is you. There's something to think about. Now off to bed, pip pip.
http://www.moviequotedb.com/movies/harry-potter-and-the-half-blood-prince/quote_67113.html