I'm serious, Harry, don't go." But Harry only had one thought in his head, which was to get back in front of the mirror, and Ron wasn't going to stop him.That third night he found his way more quickly than before. He was walking so fast he knew he was making more noise than was wise, but he didn't meet anyone.And there were his mother and father smiling at him again, and one of his grandfathers nodding happily. Harry sank down to sit on the floor in front of the mirror. There was nothing to stop him from staying here all night with his family. Nothing at all.

If we expect to “know” the truth, the whole truth and nothing but the truth, we may have a hard time seeing the whole picture, since the truth is a willful construction that allows us often merely to “guess”. ("Hinter der Mattscheibe")