◎The lights are on at three o'clock and the chicken is on at five o'clock. It's when men are studying. Black-haired people don't know how to study early, and white-haired people regret studying late. - Yan Zhenqing

◎An inch of time is worth an inch of gold, but an inch of gold cannot buy an inch of time.

◎It is easy for a young man to learn and grow old, but an inch of time cannot be taken lightly. -Zhu Xi

◎My life has its limits, but my knowledge also has no limits. - Zhuangzi

◎If a young man does not work hard, an old man will be miserable. - "Long Song Xing" ●Time is like water in a sponge, as long as you are willing to squeeze it, there is always some (Lu Xun)