“A dying culture invariably exhibits personal rudeness. Bad manners. Lack of consideration for others in minor matters. A loss of politeness, of gentle manners, is more significant than is a riot.”
Source: Friday
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Robert A. Heinlein 557
American science fiction author 1907–1988Related quotes
“The beauty of behaviour consists in the manner more than the matter of your discourse.”
The Dignity of Human Nature (1754)

Diary entry (November 1921), quoted in The Hidden Files (1992) by Derek Raymond
1920s

“There are bad manners everywhere, but an aristocracy is bad manners organized.”
The Point of View HTTP://BOOKS.GOOGLE.COM/books?id=FrQRAAAAYAAJ&q=%22there+are+bad+manners+everywhere+but+an+aristocracy+is+bad+manners+organized%22&pg=PA289#v=onepage (1882)

Gentleman
The Note-Books of Samuel Butler (1912), Part II - Elementary Morality

Source: Queer: A Novel (1985), Chapter One

“The manner is often as important as the matter, sometimes more so.”
1751
Letters to His Son on the Art of Becoming a Man of the World and a Gentleman (1774)

“That bad manners are so prevalent in the world is the fault of good manners.”
Dass soviel Ungezogenheit gut durch die Welt kommt, daran ist die Wohlerzogenheit schuld.
Source: Aphorisms (1880/1893), p. 72.