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Good manners play an important part in maintaining peace and good-wiling in a community. A man who has good manners does not hurt the feelings of others, and therefore he is on good terms with his friends and neighbors and also with others. In this way he helps to keep peace in society. 

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Good Manners are the ways which a person must learn to end up civilized in the society.It also reflects the character of a particular person.
Good Manners does not bow before any wrong doings because the moral of the person is quite high which rather provides inspiration for other people.
Example: We should not litter on road.