Sun He, the third son of Sun Quan, ruler of Eastern Wu, was appointed crown prince at nineteen. A lover of learning who respected the wise, he offered sharp insights on state affairs. Though later deposed, the people of Wu held him in deep esteem.
During the Three Kingdoms period, Sun He, a prince of the Wu Kingdom, was deeply troubled by the craze for "board games" (a type of chess) that had swept through social circles, even ensnaring high officials. He lamented to his attendants at a banquet, "Life passes like a white colt glimpsed through a crack in the wall—when old age and weakness come, what can one achieve? The greatest worry is that social ties cannot be severed, so the game persists. If one could truly abandon this trivial pursuit, it would greatly benefit their reputation and conduct." Sun He urged people to choose wholesome activities like music, chess, calligraphy, or archery instead of indulging in games that waste time and drain energy without reward.
Later, the idiom "Not an Urgent Matter" came to refer to something that is not a pressing task.
Source: *Records of the Three Kingdoms*, "Book of Wu, Biography of Sun He"
Meaning of the Idiom: Later, the Chinese idiom "不急之务" came to describe Not an Urgent Matter.