During the final years of the Eastern Han Dynasty, Wang Mang usurped the throne. His oppressive rule plunged the people into misery, sparking widespread rebellion.
In 22 AD, Liu Xiu, a member of the Western Han royal family, raised an army in Nanyang, and his power steadily grew. By 25 AD, he had pacified the realm, restored the Han dynasty, and ascended the throne, becoming known historically as Emperor Guangwu of Han.
After ascending the throne, Emperor Guangwu of Han, Liu Xiu, dedicated himself to improving the lives of his people. He reformed corrupt policies, abolished harsh taxes, restored social order, revived agricultural production, and oversaw the construction of irrigation projects. Through these efforts, the Han Dynasty regained its strength, and the common people's living conditions improved dramatically.
Emperor Guangwu of Han, Liu Xiu, was a ruler devoted to his people, laboring day and night over state affairs. Even in his sixties, he would hold court before dawn and not return to the palace until the sun was setting in the west. Eager to learn from history's cycles of order and chaos, he often discussed governance and philosophy with his ministers late into the night.
Crown Prince Liu Zhuang, seeing his father still toiling so hard at such an advanced age, admonished him, "Your Majesty possesses the wisdom of Yu the Great and Tang of Shang, yet you have lost the way of health preservation as practiced by the Yellow Emperor and Laozi. I hope from now on you will nurture your spirit, enjoy leisure and ease, and no longer hold court at dawn nor retire at midnight!"
Emperor Guangwu of Han, Liu Xiu, shook his head dismissively upon hearing this and said, "I take pleasure in this myself; it does not tire me."
It means: I do this willingly and do not feel tired.
Later, people used the idiom "Find Joy in It and Never Tire" to describe being deeply interested in something and not feeling weary.
Source: *Book of the Later Han*, "Annals of Emperor Guangwu"
Meaning of the Idiom: Later, the Chinese idiom "乐此不疲" came to describe being deeply interested in something and not feeling weary.