He watches a father with his daughter and his sight grows dim—whose chance at spring did he miss?

And now Scrooge looked on more attentively than ever, when the master of the house, having his daughter leaning fondly on him, sat down with her and her mother at his own fireside; and when he thought that such another creature, quite as graceful and as full of promise, might have called him father, and been a spring-time in the haggard winter of his life, his sight grew very dim indeed.