The four sentences of Hengqu are the famous words of Zhang Zai, a famous figure in the Northern Song Dynasty, that is, heaven and earth are the heart, life is for the people, the past is not forgotten, and the world is peaceful. Feng Youlan, a contemporary philosopher, called it "four sentences in a horizontal canal", which has been praised by people for its conciseness and grandeur.

For heaven and earth, Cheng said: Heaven and earth are unintentional, while living things are hearts. He also said: heaven and earth are unintentional, and heaven and earth are unintentional and people have a heart. The human heart is to enable people to grasp the heart of a benevolent person who is kind and helpful, and the heart of a grand duke. In fact, compassion is the heart that can't bear others, that is, don't do to others what Confucius wants, that is, the starting point of benevolence.

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Making life for the people directly comes from Mencius' thought of making life. Mencius has a cloud in his heart: those who do their best know their nature. If you know its nature, you will know its nature. Keep your heart and cultivate your nature, then things will be natural. Die young, cultivate one's morality, so make a living. Through self-cultivation, if a person can finally achieve such a state that he can maintain his sexual integrity regardless of his life span, then the individual can be said to have settled down.

Making a living for the people marked by Zhang Zai is actually making a living for the people and my compatriots. Its purpose is to teach. Training is called teaching, and teaching is also called teaching. In order to go to the sanctuary, it is the first Confucianism represented by Confucius and Mencius; A unique scholar, Taoism advocated by Confucius and Mencius. For Confucianism, Confucius is of course a master, and the Song Dynasty masters such as Lian, Luo, Guan and Min pushed the development of Confucianism to a brand-new stage.