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Where should sincerity be used in real life?

For a true friend who is loyal to himself, when you are in trouble and listen to you, he will not just treat it as someone else's business as a joke. A true friend will try his best to help you, understand you and give you a helping hand. A true friend will never forget your name and what you did. True friends don't swear at each other, because friends respect each other. Even if there is any contradiction, they will keep it in their hearts, and at most they will alienate themselves from each other and will not scold.