Harry Potter and the Order of the Phoenix (Harry Potter, #5)

by J.K. Rowling

The Dark Lord, for instance, almost always knows when somebody is lying to him. Only those skilled at Occlumency are able to shut down those feelings and memories that contradict the lie, and so utter falsehoods in his presence without detection.”

Youth cannot know how age thinks and feels. But old men are guilty if they forget what it was to be young

Harry walked slowly along the deserted corridor, peering out of windows as he went. He could see people messing around in the air over the Quidditch pitch and a couple of students swimming in the lake, accompanied by the giant squid. He was finding it hard at the moment to decide whether he wanted to be with people or not. Whenever he was in company he wanted to get away, and whenever he was alone he wanted company.