Dumbledore smiled. "You're a sharp one, aren't you? I am powerful enough that I can perform many spells silently. You probably will be too, Harry. The skills you mentioned—moving and guiding and repairing objects—are, though simple compared to conjuring a chair, far beyond what most wizards can do unaided. At Hogwarts, we will teach you the greater magics that can be performed with a wand, but you should take special care to maintain and grow the abilities you already have.