Act with courtesy - Otherwise, be polite, but always be kind. Robert Fripp
Straightforwardness without civility is like a surgeon's knife, effective but unpleasant. Candor with courtesy is helpful and admirable. Yukteswar Giri
Karate begins and ends with courtesy. Gichin Funakoshi
If you treat with courtesy your equal, who is privileged to resent an impertinence, how much more cautious should you be to your dependents, from whom you demand a respectful demeanor. Robert Chambers
I've been treating you with courtesy and respect because that's the way I choose to treat everyone. But never, ever mistake kindness with weakness. Louise Penny
Fie, thou dishonest Satan I call thee by the most modest terms for I am one of those gentle ones that will use the devil himself with courtesy sayest thou that house is dark. William Shakespeare