"Yu Chang said, there are three things to do in reading" means: I once said that there are "three things to do" in reading.
Source: From Zhu Xi's "Xun Xue Zhai Gui" in the Song Dynasty. Yu Chang said that there are "three things" in reading, which means reading with the heart, with the eyes, and with the mouth. If the mind is not here, the eyes will not look carefully. The mind will not be focused, but will only read rambles. It will never be memorized, and it will not be memorized for a long time. Among the "three arrivals", I am the most anxious. Now that the heart is there, won’t the eyes and mouth not care?
Translation: I once said: When reading, pay attention to the "three things", that is, when reading, you must concentrate, read carefully, and recite. If the mind is not on the book, then the eyes will not read carefully. If the mind and eyes are not attentive, but just read casually, they will definitely not be able to remember it, and even if they can remember it, they will not last long. Among the three, the heart is the most important. The heart has already arrived, can the eyes and mouth not reach it?
Extended information:
"Xunxue Zhaigui" shows that the ancients have never neglected the cultivation of people. The more prominent and influential people are, the more important they are to the teaching of young children. Attach great importance to it; children first learn the rules of clothing, hats, shoes and socks, then learn to talk and respond, then learn to clean, and finally learn to read, write and other behavioral norms. These are things you should know.
Zhu Xi loved education all his life. He served as an official for less than fourteen years, but he lectured for fifty years, and he never tired of it. He is rare in the history of ancient Chinese education and can be called "Confucius of the Song Dynasty". According to historical records, when Zhu Xi promoted the official affairs of tea and salt in eastern Zhejiang, he gave lectures at Fanchuan Academy. The reading method he advocates is worth learning and learning from.
Baidu Encyclopedia-"Training and Studying Zhaigui"