Earthworms do not have the advantages of minions and strong bones and muscles. They are bent on eating the earth and drinking the yellow land. -Xun Kuang, Xunzi, a thinker at the end of the Warring States Period.

If you want to study effectively, you must concentrate. Learning itself is a hard work, and only hard work will bring corresponding gains. -mathematician Gu Chaohao

Diligence is good at diligence, barren is good at playing; What I did was thought, but it was destroyed. -Han Yu