This sentence comes from the famous writer Han Yu, the leader of the Eight Great Masters of Tang and Song Dynasties. It is a famous saying about his academic studies and aims to encourage people to read more without fear of hardship. This sentence is also included in "Zengguang Xianwen". In the ancient saying "Zengguang Xianwen", there is a famous academic couplet by Han Yu, a famous poet and philosopher in the Tang Dynasty of my country: "There are roads in the mountains of books, and diligence is the path, and there is no limit to the sea of ??learning, and hard work is the boat." Han Yu's words are intended to tell people that there are no shortcuts and no smooth sailing on the road to reading and learning. If you want to learn more and broader knowledge from the vast mountains of books and oceans of learning, "diligence" and "concentration" are two essential and best conditions. "Zengguang Xianwen" is also known as "Xianwen of the Past" and "Xianwen of Ancient and Modern Times". The title of the book was first seen in the opera "The Peony Pavilion" during the Wanli period of the Ming Dynasty. From this, it can be inferred that the book was written during the Wanli period at the latest. Later, after continuous additions by literati in the Ming and Qing dynasties, it was changed into its current form, called "Zengguang Xianwen", commonly known as "Zengguang Xianwen". The author has never seen any book records. He only knows that the Confucian scholar Zhou Xitao revised it during the Tongzhi period of the Qing Dynasty. It is probably the crystallization of folk creation.