When you are good to someone, a person of high quality will feel that you are respecting him, a person of low quality will think you are trying to please him, while a person without quality will believe that you owe him. When you express kindness to someone, a high-quality person will reciprocate your kindness, a low-quality person will accept it all, while a person without quality will accept it all and then completely deny your kindness. The so-called weak tear down the platform, causing mutual harm; the strong support the platform, achieving each other; the wise build the platform, helping themselves and others. Whether to stay or go is indifferent, and this is a kind of selection. Not everyone can linger in your kindness, and not everyone deserves your goodness.