What are the ancient and modern meanings of "thirty" in the six classics of The Analects of Confucius?

Li's ancient meaning: meritorious service means achievement.

The meaning of standing: standing

The Analects of Confucius has six classics and thirty classics, which means that people have achieved something before and after the age of thirty.

Second, expand and extend:

Idiom: Stand at thirty.

Pinyin: sān SHRìl

Explanation: refers to people who have achieved something around the age of 30.

Source: Chunqiu Lu's "The Analects of Confucius for Politics": "I am determined to learn from five out of ten and stand at thirty."

For example, they all made contributions in their twenties and won the Nobel Prize in their thirties, which is really thirty. ★ Lu Jizong's "Standing at Thirty"

Synonym: thirty years old

Riddle: Take the lead

Usage: as object and clause; Refers to thirty years old

Story: In the Spring and Autumn Period, after being excluded from politics in Lu, Confucius led his disciples to travel around the world, and after hitting a wall in Wei, Zheng, Chen and Jin, he lived in seclusion in Cai. Confucius told his disciples about his experience, saying that he had been determined to be a Taoist since he was 30 years old, but he was deeply moved by his inability to sell benevolent government when he was nearly 70 years old ... Zaiyu immediately came to comfort Confucius.