What is the famous saying that never tests people's hearts?

Never test people's hearts. The sentence is:

First, don't test people easily, which will make you despair and even disappoint you.

Second, if we are simply kind to some people, it doesn't matter how much we pay, but if we pay with a purpose, then every time we pay may become every brand in our hearts in the future. When we meet an ungrateful person, what we used to be beautiful will turn into harm and stab you in the back.

Third, the cruelest thing in the world is to hurt yourself with your own love, and then gradually afraid to test people's hearts.

Fourth, we are all sad, but sometimes, despite our efforts, the ending is not so good, but more hurt. That's what people do. Selfishness is human nature, and we will think of ourselves first.

If you are not sure whether a love is true or not, don't ask others if they are sincere to you, and don't test whether they have you in their hearts, because the truth may be more painful, and whether a person is sincere or hypocritical to you. In fact, as long as you put your heart into it, you can see that testing people's hearts is equivalent to spreading salt on your wound and deepening the injury, so don't try it easily.