And his knowledge remained woefully incomplete, Harry! That which Voldemort does not value, he takes no trouble to comprehend. Of house-elves and children's tales, of love, loyalty, and innocence, Voldemort knows and understands nothing. Nothing. That they all have a power beyond his own, a power beyond the reach of any magic, is a truth he has never grasped.
J. K. RowlingHe [Uncle Vernon] held up the envelope in which Mrs. Weasleyโs letter had come, and Harry had to fight down a laugh. Every bit of it was covered in stamps except for a square inch on the front, into which Mrs. Weasley had squeezed the Dursleysโ address in minute writing. โShe did put enough stamps on, then,โ said Harry, trying to sound as though Mrs. Weasleyโs was a mistake anyone could make.
J. K. Rowling