The first time the band Sixpence None the Richer appeared on "The Late Show" with David Letterman, lead singer Leigh Nash was interviewed briefly by the king of sarcasm and putdowns. Letterman asked if the band's name was a literary reference. "Thanks for asking," Nash replied, fighting her nervousness. "I will quickly tell you. It's from a book by C.S. Lewis. The book is called 'Mere Christianity.'" Nash later admitted that she was scared, but that being on the show was a dream come true for her. Though her bandmates were laughing and Letterman was wiggling his tongue in his cheek and acting like he didn't understand what she was talking about, Nash continued. "I really want to tell you the story," she said to Letterman. "Do you want to hear it?" Letterman said he did, so Nash began her explanation. "A little boy asks his father for a sixpence, which is a very small amount of English currency, to go and get a gift for his father. The father gladly accepts the gift, but he also realizes that he is not any richer for the transaction because he gave his son the money in the first place." "He bought his own gift," noted Letterman. "That's right, pretty much," said Nash. "I'm sure it meant a lot to him, but he's really no richer. C.S. Lewis was comparing that to his belief that God has given him and us the gifts that we possess and that to serve him the way that we should, we should do it humbly--with a humble heart--realizing how we got the gifts in the first place." "Well, that's beautiful," Letterman said. "Charming."