Manners are a sensitive awareness of the feelings of others. If you have that awareness, you have good manners, no matter what fork you use.
What used to be called 'good manners' is now regarded as mere affectation. Open a door for a young woman, and she's likely to call security.
Nothing seems at first sight less important than the outward form of human actions, yet there is nothing upon which men set more store: they grow used to everything except to living in a society which has not their own manners.
Friends and good manners will carry you where money won't go.
Using adverbs is a mortal sin.