There is a road in the mountain of books, but there is no limit to learning the sea. -Tang Hanyu's Persuasion

A lazy youth, a lousy age. -"Long Songs"

Every day when the cock crows, it is the best time for boys to read. Teenagers only know how to play, but don't know how to study hard. When they are old, they regret why they didn't know how to study hard when they were young. -Don Yan Zhenqing's Persuasion

Nothing, but reading is high. -Song Wang Zhu's "Poetry of a Prodigy"