Upon his return to Lu, he gained renown as a teacher, but when he was 35, Duke Zhao of Lu led his country to war, was routed and fled to the neighboring country of Qi; in the disorder following the battle, Confucius followed. Duke Zhao frequently came to him for advice, but upon counsel of one of his ministers, he decided against granting land to Confucius and gradually stopped seeking his counsel. When other nobles began plotting against Confucius' position, Duke Zhao refused to intervene, and Confucius returned to Lu. But conditions there were no better than before, and Confucius retired from public life to concentrate on teaching and studying.

At age 50, he was approached by the Baron of Qi to help defend against a rebellion, but he declined. He was later made a city magistrate by the new Duke of Lu, and under his administration the city flourished; he was promoted several times, eventually becoming Grand Secretary of Justice and, at age 56, Chief Minister of Lu. Neighboring countries began to worry that Lu would become too powerful, and they sent messengers with gifts and dancers to distract the duke during a sacrifice holiday. When the duke abandoned his duties to receive the messengers, Confucius resigned and left the country.

Confucius spent the next five years wandering China with his disciples, finding that his presence at royal courts was rarely tolerated for long before nobles would begin plotting to drive him out or have him killed. He was arrested once and jailed for five days, and at 62 he was pursued, along with his disciples, into the countryside by a band of soldiers sent by jealous nobles, until he was able to send a messenger to the sympathetic king of a nearby country, who sent his own soldiers to rescue them. Once again, Confucius was to be given land but was denied it upon counsel of another high minister. After further wanderings, he eventually returned to Lu at age 67. Although he was welcomed there and chose to remain, he was not offered public office again, nor did he seek it. Instead he spent the rest of his years teaching and, finally, writing. He died at 72.