In ancient China mythology, there are stories about Kuafu chasing the sun and jingwei filling the sea. In folklore, there are beautiful stories about grinding a pestle into a needle and stealing light from the wall. In ancient historical materials, there are Dayu Zhi. (1) struggle hard.

(2) such as: a porridge and a meal, when thinking hard; Half a silk and half a wisp, it is difficult to keep thinking about material resources. Difficulties and hardships, jade is successful. Be prepared for danger in times of peace, and refrain from extravagance and frugality. Born in sorrow, died in happiness and so on.