The Etiquette of To-Day (1918‪)‬

"The customs of social life need frequent restating and adaptation to new needs. They are customs because they are the best rules of conduct that have been garnered from the experiences of succeeding generations under common conditions. To know them, to catch their spirit, and to follow them in an intelligent way, without slavish punctiliousness but with careful observance, make one skillful in the art of social intercourse, and at home in any society..."