Don’t wait and see, your young head will turn gray and you will be filled with sorrow.

It is better to be diligent than to play.

The lights are on at three o'clock and the chicken is on at five o'clock, which is when men are studying.

Hearing the chicken dancing (Eastern Jin Dynasty, Zu Ti) The cantilevered beam stabs the buttocks (Sun Jing, Su Qin) The firefly reflects the snow, and the wall is chiseled to steal the light

In the Eastern Zhou Dynasty, Su Qin felt sleepy while studying. In the Western Han Dynasty, Sun Jing studied hard day and night, tying a rope to his head and hanging from the roof beam.

In the Western Han Dynasty, Kuang Heng studied hard and studied by cutting out walls without candles. In the Jin Dynasty, Che Yin (yìn) Nang Ying studied.