therefore, if you don't accumulate steps, you won't be able to travel thousands of miles; If you don't accumulate a small stream, you can't become a river. Xu Ma, ten drivers, never give up. Persevere, never break a dead wood; Perseverance, the stone can be carved. (Xunzi's "Persuasion on Learning")

Therefore, people are going to be great, so they must first suffer from their will, work hard on their bones and muscles, starve their skin, and be empty of their body, so they can't be patient.

People can change after they have passed; Trapped in the heart, balanced in consideration, and then made; Sign in color, hair in sound, and then metaphor. If you enter, there will be no legalist, but if you leave, you will be invincible to foreign patients, and the country will die forever. < P > Then you will know that you were born in sorrow and died in happiness. (Mencius, under the accusation)