It means to treat benevolence, righteousness, propriety and wisdom with sincere respect. You can do it according to the requirements of benevolence, propriety and wisdom without deliberately stopping and restraining yourself or thinking about it.

The Book of Knowing Benevolence, which is contained in Volume II of Cheng Er's Suicide Letter, is a famous article about philosophy education when Cheng Hao (1032- 1085), a scholar of the Northern Song Dynasty, gave a lecture in Luoyang in the second year (1079), and it is a record that highlights his master Lu Dalin.