What are the sentences for people who see clearly the human heart and humanity?

1. As soon as people leave, tea gets cold, which is a natural law. When people are gone, tea will get cold. This is a cold world. As the saying goes, it is difficult to paint a tiger's skin but a bone, and people know its face but not its heart.

2. Many times, you help others, but no one helps you at the critical moment. A sincere heart is in exchange for chilling. Ungrateful people regard your kindness as dry food and enjoy it insatiably; People who push their luck treat your accommodation as fat and plunder it unscrupulously.

People's eyes have 576 million pixels, but they can't understand people's hearts after all. One day, we will all understand that the first thing people should love is always themselves.

We often sigh that the world is getting worse, the world is cold and resentful. However, I accidentally passed it again and again, and I gradually became that kind of person. We often sigh that people are unpredictable, and slowly we become unfathomable to protect ourselves.

An ungrateful person is a snake. Turn around and forget your good. I bow to you when I need you; I am cold to you when I don't need you.