She wasn't looking her best; her hair was coming down, for she had shed hairpins as she'd run, and her face lacked powder and lipstick. She looked hot and tired and surprisingly happy. He thought that he had never seen anyone quite as beautiful, so absolutely necessary to his happiness. It wasn't the first time he had fallen in love, but he knew that this was the last.
He sighed deeply; to fall in love at first sight with this malodorous sleeping girl, with, as far as he could see, no pretentions to beauty or even good looks, was something he had not expected. But falling in love, he had always understood, was unpredictable, and, as far as he was concerned, irrevocable.
She had been the quiet, rather plain girl, with a surprisingly sharp tongue if she was put out, lovely eyes and pretty hair and a way of looking very directly at one. Now he had to admit that she had become more important to him than anyone else in the world. The idea of a future without her wasn't to be borne. She had by some mysterious metamorphosis become more beautiful than anyone else he had ever encountered.
One falls in and out of love, but when one loves that is an entirely different matter, for that lasts through life and beyond, and is a rare thing.