A polite enemy is just as difficult to discredit, as a rude friend is to protect.

No one is more insufferable than he who lacks basic courtesy.

Good manners are appreciated as much as bad manners are abhorred.

Courtesy is a silver lining around the dark clouds of civilization; it is the best part of refinement and in many ways, an art of heroic beauty in the vast gallery of man's cruelty and baseness.

Politeness is half good manners and half good lying.

Oh, hon, it's the little courtesies that make life bearable, I find, wouldn't you agree?