If a stranger called and interrupted you, you said with your hearty tongue, "I'm glad to see you," and said with your heartier soul, "I wish you were with the cannibals and it was dinner-time." When he went, you said regretfully, " Must you go?" and followed it with a "Call again;" but you did no harm, for you did not deceive anybody nor inflict any hurt, whereas the truth would have made you both unhappy.
I think that all this courteous lying is a sweet and loving art, and should be cultivated. The highest perfection of politeness is only a beautiful edifice, built, from the base to the dome, of graceful and gilded forms of charitable and unselfish lying,
- Mark Twain, On the Decay of the Art of Lying