You can deny all you want that there is etiquette, and a lot of people do in everyday life. But if you behave in a way that offends the people you’re trying to deal with, they will stop dealing with you.
Judith Martin (b. 1938) American author, journalist, etiquette expert [a.k.a. Miss Manners]
Interview (1995-03-06) by Virginia Shea, “Miss Mannners’ Guide to Excruciatingly Correct Internet Behavior,” Computerworld, Vol. 29, No. 10
(Source)
Quotations about:
ostracism
Note not all quotations have been tagged, so Search may find additional quotes on this topic.
But this I will advise you to, which is, never to attack whole bodies of any kind; for, besides that all general rules have their exceptions, you unnecessarily make yourself a great number of enemies, by attacking a corps collectively. Among women, as among men, there are good as well as bad; and it may be full as many, or more, good than among men. This rule holds as to lawyers, soldiers, parsons, courtiers, citizens, &c. They are all men, subject to the same passions and sentiments, differing only in the manner, according to their several educations; and it would be as imprudent as unjust to attack any of them by the lump. Individuals forgive sometimes; but bodies and societies never do.
Lord Chesterfield (1694-1773) English statesman, wit [Philip Dormer Stanhope]
Letter to his son, #110 (5 Apr 1746)
(Source)
The individual is not accountable to society for his actions in so far as these concern the interests of no person but himself. Advice, instruction, persuasion, and avoidance by other people, if thought necessary by them for their own good, are the only measures by which society can justifiably express its dislike or disapprobation of his conduct.
John Stuart Mill (1806-1873) English philosopher and economist
On Liberty, ch. 5 “Applications” (1859)
(Source)



