I have seen some people rude, by being overcivil and troublesome in their courtesy.
Still, these excesses excepted, the knowledge of courtesy and good manners is a very necessary study.

It is, like grace and beauty, that which begets liking and an inclination to love one another at the first sight, and in the very beginning of acquaintance; and, consequently, that which first opens the door and intromits us to instruct ourselves by the example of others, and to give examples ourselves, if we have any worth taking notice of and communicating..