A poem describing the reasons for the development of things.

Shun was born in mu, Fu Shuo was born in the middle of the building, and the glue was in fish and salt. Guan Yi I was a scholar, Sun Shuai was in the sea, and a hundred miles was in the city. Therefore, the day will drop to a great post, and people must first suffer their minds, their bones and muscles, starve their bodies and skin, and do whatever they want, so they can't bear it. People are unchangeable, and then they can change. Trapped in the heart, weigh the considerations, and then make. Color label, sound hair, and then metaphor. A country, if there are no ministers and wise men who can assist the king, will often be in danger of the collapse of its neighboring countries and the misfortunes from abroad. Then knowledge is born of worry and dies of happiness. "