“A polite enemy is just as difficult to discredit, as a rude friend is to protect.”
“It is a wise thing to be polite; consequently, it is a stupid thing to be rude. To make enemies by unnecessary and willful incivility, is just as insane a proceeding as to set your house on fire. For politeness is like a counter--an avowedly false coin, with which it is foolish to be stingy.”
“Only a true best friend can protect you from your immortal enemies.”
“Reading at meals is considered rude in polite society, but if you expect to succeed as a writer, rudeness should be the second-to-least of your concerns. The least of all should be polite society and what it expects.”
“I apologise for my friend's rudeness, he just learned how to to walk upright last year.”
“Friends are just enemies you don’t know enough about.”