Keep good relationship and kind heart

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We know that most of thing have dual character. Just now i wait for my friend. I hear conversation of two people. They saw a luxury car which was parked near them. On man said,'The man who is in the car can not has inner beauty.' Another man said,'Maybe, i'm not sure, but i make sure that someone who speak like that must do not have more money.'. When you feel jealous you should think of yourself. We shoul have a kind heart to keep a good relationship with your friends or other people. I think good attitude can keep good relationship. What's your opinion?