I. Source and meaning:
This sentence comes from Xiang Zhuan written by Confucius for Zhouyi.
People don't seem to fully understand the meaning of this sentence, but it can be roughly understood as follows: "a gentleman" should be as healthy as the sky, and he should constantly strive for self-improvement; ; A gentleman should bear everything with kindness like the earth.
Second, the extension:
1, about Zhouyi
The Book of Changes is the Book of Changes. Some scholars think that it is one of the three changes, while others think that the Book of Changes is the three changes.
The third change may be Lianshan, Guizang and Zhouyi. If anyone dares, the first two have already lost.
According to legend, The Book of Changes was written by Zhou Wenwang Jichang, and its contents include classics and biographies. The classics are mainly composed of 64 hexagrams and 384 hexagrams. Biography contains seven explanations of hexagrams, collectively known as Ten Wings, which is said to have been written by Confucius.
2. About Xiang Chuan
The Book of Changes is a collection of works to explain and develop the Book of Changes during the Warring States Period. Its theory originated from Confucius, which was formed by Confucius' later study. There are seven kinds of Yi Zhuan 10, which are the upper and lower chapters of Xun Zhuan, Xiang Zhuan, Classical Chinese Zhuan, Ci Zhuan, Shuo Gua Zhuan, Xu Gua Zhuan and Za Gua Zhuan respectively. Since the Han Dynasty, they have also been called "Ten Wings".