The principle of sincerity is an important principle of the golden mean. "Only when the world is sincere can we do our best. If you can do your best, you can do your best; If you can make good use of human nature, you can make good use of things; If you can make the best use of it, you can praise the teaching of heaven and earth; If you can praise the cultivation of heaven and earth, you can go to heaven and earth. " Only by adhering to the principle of sincerity can we give full play to our kind nature. If you can exert your kind nature, you can influence others and exert their kind nature; If the goodness of all people can be brought into play, the goodness of all things can be brought into play; If we can give full play to the goodness of everything, we can participate in the cultivation of everything in heaven and earth. Reached the realm of benevolence and goodness; When you reach the realm of benevolence, you can rank third with heaven and earth. This is an ideal state achieved by adhering to the principle of sincerity. When this ideal state is reached, a person finds his real position in the universe.