In "10 lb Penalty" by Dick Francis, the protagonist reflects on a lesson shared by his father regarding etiquette and politeness when visiting others' homes. The father emphasizes the importance of being gracious and kind, regardless of personal opinions about the surroundings. This advice is reinforced by the context of having received multiple invitations that morning, indicating the father’s keen awareness of social interactions.

The principle highlighted is one of diplomacy and consideration for others' feelings. By expressing admiration for the host's space, even when it may not align with one's tastes, the protagonist learns to navigate social situations with respect and tact. This lesson serves as a reminder of the value of kindness in fostering positive relationships.