DUTY, n. A concept of slaves, a tool of tyrants. Doing what others want you to do because they want you to do it.
(to paraphrase Oscar Wilde’s comment in The Soul of Man Under Socialism)
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— from The American Heretic’s Dictionary (revised & expanded), the 21st-century successor to Ambrose Bierce’s Devil’s Dictionary. (The link goes to 50 sample definitions and illustrations.)