But: only.
I'm worried. Be swayed by considerations of gain and loss.
Useless: useless.
The author advises the world to read more books. As long as you read good books, you can cultivate your self-cultivation and improve your quality, so don't be afraid that you won't need them in the future.
Extended data
The author of this famous saying is Zhu Zhiyu (1600165438+10/7-1May 23, 682), whose real name is Chu Yu, also known as Lu Yu, and whose word is Shunshui, Han nationality, is from Yuyao County, Shaoxing Prefecture, Zhejiang Province. Because he was characterized by the emperor three times in the late Ming and southern Ming dynasties, he was called the monarch before his death. Scholars and educators in Ming and Qing Dynasties.
Zhu Zhiyu is clever and studious, but he despises fame. After the Qing army went south to the south of the Yangtze River, Zhu Zhiyu actively participated in the anti-Qing struggle. First, he followed King Lu, who turned down Zhoushan in the corner, and then he took part in the famous Qing soldiers Zheng Chenggong and Zhang Huangyan in the Northern Expedition. In the 16th year of Qing Shunzhi (1659), Zhu Zhiyu saw that the Qing regime was getting stronger and stronger, and there was no hope of regaining sight. In order to preserve national integrity, he resolutely left his native land, abandoned his hometown and went into exile in Japan.
Zhu Zhiyu stayed in Japan for more than twenty years, still dressed in Ming Dynasty clothes and thinking about his motherland.
His knowledge and virtue are treated with courtesy and respect by Japanese people in the ruling and opposition circles. Mito's vassal owner, Mitsuo Tokugawa, hired him to give lectures in Edo (present-day Tokyo) and hold a ceremony to accept disciples. Many famous scholars come here to study.
In his lectures, Zhu Zhiyu abandoned the empty preaching in Confucianism and advocated "applying what he has learned, applying what he has learned". He believes that "the way to learn lies in doing, and the knowledge of sages lies in doing", and his thoughts have a great influence on mitosis in Japan.
He also taught the Japanese people China's advanced agriculture, medicine, architecture and technology. The "Edo School" with the aim of "Shun Shui" has always influenced the Meiji Restoration and contributed to the prosperity and progress of Japan.
After Zhu Zhiyu's death, his lectures and questions and answers were included in 28 volumes of Zhu Shunshui's Collected Works by Tokugawa Hiroyuki and his son. Zhu Zhiyu, Huang Zongxi, Wang Fuzhi, Gu and Yan Yuan are also called "China's Five Great Masters in the Late Ming and Early Qing Dynasties".