"Courtesy is doing that which nothing under the sun makes you do but human kindness. Courtesy springs from the heart; if the mind prompts the action, there is a reason; if there be a reason, it is not courtesy, for courtesy has no reason. Courtesy is good will, and good will is prompted by the heart full of love to be kind. Only the generous man is truly courteous. He gives freely without a thought of receiving anything in return."

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You must all know half a dozen people at least who are no use in this world, who are more trouble than they are worth. Just put them there and say Sir, or Madam, now will you be kind enough to justify your existence? If you can't justify your existence, if you're not pulling your weight in the social boat, if you're not producing as much as you consume or perhaps a little more, then, clearly, we cannot use the organizations of our society for the purpose of keeping you alive, because your life does not benefit us and it can't be of very much use to yourself.

— George Bernard Shaw