William Graham Sumner,
Folkways
“ There may be some psychology of expletives,410 but they seem to be accounted for, like slang, by the expediency of expression, which is the purpose of all language. There is a need for expression which will win attention and impress the memory. A strong expletive shocks an opponent, or it is an instinctive reaction on a situation which threatens the well-being of the speaker. It is a vent to emotion which gives relief from it when other relief is not possible. ”
