There are many famous sentences about gentlemen in Confucian classics. Please write a sentence to explain what a gentleman is.
Ting Yun, the son of Shu in the West of Zhuge Lu, Nanyang, is a famous sentence in the humble room inscription by Liu Yuxi, a poet in the Tang Dynasty! Zhuge Lu refers to the living room before Zhuge Liang came out of the mountain. Zhuge Liang's famous saying, "If you are not indifferent, you can't be clear, and if you are not quiet, you can't be far away", which is basically consistent with the thoughts expressed by Liu Yuxi in this article.