I don't think you should have to try to be nice, I think most people are nice. I think being cheerful and nice is just a politeness.
Graham Norton
Politeness is to human nature what warmth is to wax.
Arthur Schopenhauer
The only true source of politeness is consideration.
William Gilmore Simms
Politeness is organized indifference.
Paul Valery
Politeness makes one appear outwardly as they should be within.
Jean de la Bruyere
Courteousness is consideration for others; politeness is the method used to deliver such considerations.
Bryant H. McGill