Tā tuìxiū hòu hái zài fǔdǎo háizi, zhēnshì huìrén-bùjuàn.
Even after retirement he tutors children - truly tireless in teaching.
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From 《论语·述而》, Confucius's own self-description in the Analects. The classic pair with 学而不厌 defines the Confucian ideal of the lifelong scholar-teacher.