Méiyǒu chángshèng de jiāngjūn, shībài zhōng yào xuéhuì chéngzhǎng.
There is no ever-victorious general; one must learn to grow through defeat.
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history
The phrase is associated with the 常胜军 (Ever Victorious Army), a 19th-century Qing dynasty force led by foreign officers including Frederick Ward and Charles Gordon, which helped suppress the Taiping Rebellion.