Truth is a child of time, not of authority.

——Brecht

Young people work hard all their lives, and don’t waste time and effort to make any effort——Du Xunhe of the Tang Dynasty

The ancients spared no effort in learning, and the young and old can only achieve success through hard work——Lu You of the Song Dynasty "Winter Night Reading Shows Ziyu"

When hundreds of rivers reach the east to the sea, when will they return to the west? If a young man does not work hard, an old man will be sad - Han Dynasty Yuefu folk song "Long Song Xing"

Youth must be started early, how can you grow into a young man - "Encouragement to Learning" by Meng Jiao of the Tang Dynasty

Don't wait, the young man's head will turn gray, and he will be sad - Yue Fei of the Song Dynasty, "The River is Red"