COURTESY, POLITENESS AND MANNERS:

Courtesy is consideration for the comforts and convenience of others.Politeness and manners are the practice of special littlecustoms, which have become traditional. Manners without courtesy are insincere and empty. Courtesy without manners is sincere and kind, but clumsy. The three together are like good oil in the social machinery. They make things run smoothly and pleasantly.

GEM:
 All doors open to courtesy.