Read the passage.

excerpt from how to behave: a pocket manual of republican etiquette by samuel r. wells

good manners are not to be put on and off with one's best clothes. politeness is an article for every-day wear. if you don it only on special and rare occasions, it will be sure to sit awkwardly upon you. if you are not well behaved in your own family circle, you will hardly be truly so anywhere, however strictly you may conform to the observances of good breeding, when in society. the true gentleman or lady is a gentleman or lady at all times and in all places, at home as well as abroad, in the field, or workshop, or in the kitchen, as well as in the parlor. a snob is a snob always and everywhere.
what is the author's purpose in this passage?

to convince people to freely express their emotions

to persuade people to demonstrate good manners at all times

to encourage people to embrace the feeling of superiority over others

to remind people to avoid individuals who occasionally display bad manners