The sky is strong, the gentleman is self-improvement; the earth is Kun, the gentleman is virtuous. Which ancient poem is it?

The correct sentence should be: "The sky walks with health, the gentleman is unceasing in his self-improvement; the earth's momentum is Kun, the gentleman carries things with great virtue", not "the sky walks with health.

This sentence is from "Xiangzhuan", a book written by Confucius for the Zhouyi (The Book of Changes).

People do not seem to have fully clarified the meaning of this sentence, but it can be generally understood as follows: "A gentleman should be as "healthy" and self-reliant as the sky; a gentleman should be as virtuous as the earth in carrying all things.

Two, extend:

1, about the "Zhouyi"

"Zhouyi" that is, the "I Ching", some scholars believe that it is one of the "three Yi," some scholars believe that the I Ching that is the three Yi.

Three Yi may be "Lianshan", "Guizang", "Zhouyi", such as who dares the first two have been lost.

The Zhou Yi is rumored to be made by the Zhou Wen Wang Ji Chang, the contents of which include two parts, the "Jing" and "Biography". The "Jing" is mainly sixty-four hexagrams and three hundred and eighty-four lines, "Biography" contains the interpretation of the hexagrams and lines of the seven kinds of rhetoric **** ten, collectively known as the "ten wings", is said to be compiled for the Confucius.

2, on the "Elephant Chuan"

The "Yi Chuan" is a collection of essays during the Warring States period to explain and play the "I Ching", the doctrine of the original in the Confucius, the specific success in the hands of the latter. There are 7 kinds of 10 articles in Yi Chuan***, which are Tuan Chuan (彖传) up and down, Xiang Chuan (象传) up and down, Wen Yan Chuan (文言传), Xiang Chuan (系辞传) up and down, Shuogua Chuan (说卦传) up and down, Preceding Gua Chuan (序卦传) up and down and Miscellaneous Gua Chuan (雜卦传). Since the Han Dynasty, they are also known as the "Ten Wings".