What are the "old morality" and "new morality" in the New Culture Movement?

The old morality mainly refers to the Three Principles and Five Constants (the Three Principles refer to the principle that the ruler is the subject, the father is the son, and the husband is the wife. The Five Principles usually refer to benevolence, righteousness, courtesy, wisdom and trust) as the center of Confucian ethics. Li Dazhao published between 1916 and 1917 a succession of papers against the veneration of Confucius, such as "Confucius and the Constitution" and "The Ethical View of Nature and Confucius". His view was that Confucius was the talisman of the feudal emperors who practiced autocratic rule for thousands of years, and that Confucianism's fetters on people's minds were even more serious than the physical tyranny imposed by the autocratic emperors. Today's times are different from those of the past, and people's moral values should change with the times. They also fiercely attacked the feudal family system, combining Confucian ethics with feudal autocracy and the feudal family system. In the name of opposing the old rites and morals, The New Youth held heated discussions on the issue of women's emancipation and the issue of the feudal family, and publicized the ideas of equality between men and women and the emancipation of individuality.

New Youth put forward the slogans of advocating the vernacular language and overthrowing the literary language, and advocating new literature and overthrowing the old literature. 1917, Hu Shih published Ruminations on the Improvement of Literature in the magazine New Youth, which put forward the idea of replacing the literary language with the vernacular language. Hu Shi's proposition focused on the reform of literary form. Chen Duxiu followed with his Literary Revolution, which called for a revolution in literature not only in form but also in content. The New Youth switched to the vernacular language and adopted a new style of punctuation from the first issue of its four volumes. Some new-style poems also began to appear in New Youth. Lu Xun was the main general of the cultural revolution, he published short stories "Diary of a Madman" and some sharp miscellaneous essays one after another, brilliantly combining the revolutionary content of anti-feudal old rituals with the form of the vernacular language, and set up a model of new literature.