Remarks:
Heaven rewards diligence, which means no pains, no gains, and it is praised as more pains and more gains by ancient and modern Chinese and foreign countries.
God will reward those who work hard, and their efforts will be rewarded. More hard work, more harvest, as long as you make enough efforts, even if you don't see direct benefits, you will definitely get corresponding returns in the future. Rewarding diligence in heaven is a commonly used inspirational idiom.
Self-improvement literally means: if you want to be strong, you must make unremitting efforts.
The profound meaning is: even if a person's situation is worse, he can achieve a strong self through unremitting efforts and dedication. If he wants to be strong, he must persist and never give up his efforts. Language "Zhouyi Gan": "Heaven is healthy, and gentlemen are constantly striving for self-improvement."