"The master said that a gentleman is a gentleman, but he can't say that." What kind of professionalism does this paragraph emphasize?

Note: Ji Zicheng: Dr. Weiguo. Master: This refers to Ji Zicheng. In ancient times, doctors could be addressed as "masters", so Zi Gong called him that. In ancient times, horses were used to drive cars, so it means: your tongue moves fast, as soon as you say it. Even if it is said, the implication is to emphasize the importance of coat color patterns (words).

Ji Zicheng said, "A gentleman values simplicity, so why is there any decoration?" Zi Gong said, "What a pity! Sir, you should explain a gentleman like this. A promise is a promise, but it is hard to take back. Decoration is as important as simple nature, and simple nature is as important as decoration. If the coat color pattern is removed, there is no difference between tiger leopard skin and dog sheepskin. "