Where did this sentence come from and who said it?

The sentence "Heaven is strong, and a gentleman strives for self-improvement" comes from the Book of Changes. Health: energetic. The meaning of this sentence is: nature is vigorous and endless, and a gentleman should strive to make progress like nature and never stop. This sentence was originally used to explain the "dry" divination, and later it was often used to encourage others. This is the origin of the idiom "self-improvement".

"Zhouyi" said: Tian Xingjian, the gentleman constantly strives for self-improvement; The capacity of the earth is limited, so a gentleman must constantly cultivate his own virtue to undertake the world. ? The last sentence, "Heaven is healthy, and gentlemen are constantly striving for self-improvement", is more widely circulated. But for two thousand years, many people know and few people can understand. Moreover, there are different explanations in academic circles. At present, there seems to be no recognized correct explanation. ? The original book of changes? The first divination of the Book of Changes is to do something for heaven. The elephant said: Heaven is healthy, and gentlemen are constantly striving for self-improvement. If you don't use the hidden dragon, Yang is next. See the dragon in the field, Deshipu also. Do it all day, over and over again. Or jump into the abyss and have no regrets. Fei long is in the sky, and Niu San is also there. Kang long has regrets and cannot last long. With nine, Tiande can't be the first.

People who work hard are also people who start from scratch. Chastity, temperament also. In the beginning, we can use beauty to benefit the world, not words. Great! What a big deal! Strong and upright, pure and free from vulgarity. Give full play to six ideas and bypass feelings. Take six dragons to rule the sky. Clouds are raining and the world is flat. ? A gentleman's virtue can be seen every day. Implicit words are also hidden, but not seen, which is also used by gentlemen. A gentleman learns to gather, argue, tolerate and be kind. ?

Interpretation 1:? I ching said:? Dry for the horse, Kun for the cow. ? Symbolize the sky in Malay. ? So it is not difficult to understand that a good horse is constantly striving for self-improvement; Kun is a cow, and cows are used to interpret people's morality. ? Some ancient sentences don't need to be elaborated, but the key lies in personal taste. ? Interpretation 2:? The Book of Changes says: Heaven is healthy, and gentlemen are constantly striving for self-improvement; The capacity of the earth is limited, so a gentleman must constantly cultivate his own virtue to undertake the world. "Tian Xingjian" and "Terrain Kun" lost their symmetry. What happened? ? According to the silk book Zhouyi, "Gan" is the key, "Tian Xingjian" is the key of heaven, "Key" is the ancient word of "Gan", and "Key" is also trained as "Sword", which are strung together: God, Action and Cao (key).