少壮不努力，老大徒伤悲

a sound mind in a sound body.

健全的精神寓于健康的身体。

a still tongue makes a wise head.

寡言者智。

a stitch in time saves nine.

小洞不补，大洞吃苦。

a straight foot is not afraid of a crooked shoe.

身正不怕影子斜。

a wise head makes a close mouth.

真人不露相，露相非真人。

a word spoken is past recalling.

一言既出，驷马难追。

a years plan starts with spring.

一年之计在于春。

a young idler, an old beggar.

努力于工作