It means that people's self-cultivation is comprehensively improved from the internal and external levels. "Intrinsic" refers to the inner moral cultivation and connotation, which requires years of precipitation and constant tempering to control yourself. "Appearance" refers to people's behavior and verbal expression, which is mapped from the inside out to both form and spirit, not empty and superficial. The so-called "both internal and external cultivation" means paying attention to the etiquette of external performance and the improvement of internal moral cultivation, and finally achieving an all-round improvement of self-cultivation.