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A code of behavior is an inevitable part of life in any community, and if we hadn't inherited ours, we should have had to invent one.

Millicent Fenwick (1948). “Vogue's book of etiquette: a complete guide to traditional forms and modern usage”
A code of behavior is an inevitable part of life in any community, and if we hadn't inherited ours, we should have had to invent one.