It grows in the sludge, but it is not polluted. Mud: mud at the bottom of the water; Dye: stain.
Used as attribute, object and clause; In a dirty environment, keep pure.
Moral metaphor comes out of vulgar environment, but it can maintain pure quality and not be contaminated with bad habits.
Calligraphy "emerges from the mud without being stained"
In the Northern Song Dynasty, the founder of Neo-Confucianism wrote books by the Lianxi River at the foot of Lotus Peak in Lushan Mountain. He wrote Taiji Illustration and Shu Tong, and put forward a simple and systematic theory of the universe. He thinks chrysanthemum is like a hermit, peony is like a rich man, and lotus is like a gentleman.