Art can be learned, but it also means that people's talents can be mastered through learning, and their character can be improved through hard work.

source: Han Zhang Heng's Should Be Idle.

Revelation: Skills can be acquired through study, while conduct can be improved through hard work. This paper expounds the possibility of improving moral cultivation by comparing skills with learning.

Zhang Heng's other famous sayings:

1. Water carries a boat, so it overturns it.

Revelation: Water can be used to carry ships or capsize them. This paper compares the relationship between the monarch and the people with the relationship between the water boat, emphasizing that the monarch must love the people, otherwise the people can support him as a monarch, or they can overthrow him and throw him into the garbage dump of history.

2. What you value is only the virtuous, and what you treasure is only the valley.

Revelation: It's only important to get talented people to govern the country, while ordinary people only value food. This is the truth that talent is the treasure of the country and food is the most important thing for the people.

Zhang Heng mainly influenced

In the first year of Yangjia, Zhang Heng invented the earliest seismograph, called Houfeng seismograph. According to "Zhang Hengchuan in the Later Han Dynasty", the seismograph was made of pure copper, with a round diameter of eight feet, a protruding top cover shaped like a wine bottle, and decorated with the image of mountain turtles, birds and beasts in seal script.

on the basis of the armillary sphere invented by Geng Shouchang in the Western Han Dynasty, Zhang Heng created a more accurate and comprehensive armillary sphere according to his own theory of armillary sphere. Ruilun pod is an automatic calendar created by Zhang Heng. It imitates the characteristics of strange trees and pods in mythology. By the action of running water, one leaf appears one day from the first day of each month until the full moon, and then one leaf is put away every day until the end of the month.

above content reference: Baidu Encyclopedia-Zhang Heng