Don't be idle, it's white and sad. -Yue Fei
It is difficult for young people to learn and grow old, and an inch of time is not light. -Zhu
A year's plan lies in spring, and a day's plan lies in morning. Xiao Yi
Once the youth is gone, it will never come again, and you will never see the arrival of the next day. Encourage yourself in time, time waits for no one. -Tao Yuanming
Youth is an open-minded period, and we should use this period to cultivate our open-minded character. -(British) Russell