1. When Heaven is about to assign a great responsibility to a person, he must first strain his mind and will, strain his muscles and bones, starve his body and skin, deplete his body, and mess up his actions. Source: "Mencius Gaozi Xia".

Careless When God is about to entrust a person with a major mission, he will first suffer from mental suffering, physical fatigue, starvation, thin skin, and always do things unsatisfactory.

2. Heaven is moving vigorously, and a gentleman strives to constantly strive for self-improvement. Source: "Book of Changes·Qian·Xiang". It should be noted that the movement of the celestial bodies is continuous and vigorous, and talented and virtuous people should strive for self-improvement just like the movement of the celestial bodies.

3. There are many difficulties in front of you. Since ancient times, men should strive for self-improvement. Source: Li Xianyong's "Giving People Away". No matter how many unsatisfactory things happen in front of you, men must always be self-reliant.