The practice of politeness is a collection of habits of mind and expression you do on a daily basis. You learn to say “thank you” because you are honestly grateful and “I’m sorry” because you honestly don’t want to contribute to the pain of the world. You learn to say “it’s ok” because you’re honestly forgiving and letting go of small things other people do wrong. This practice makes the rate of unproductive and acrimonious conversations go down, and the enemies you make are usually only the unavoidably unpleasant.
~ Quinn Norton, from How to be Polite… for Geeks