Disciple of Confucius known for devotion to his parents and for 吾日三省吾身, 'every day I examine myself three times'. Tradition credits him with the 大学 and the 孝经.
'Every day I examine myself on three points' was said by Zengzi.
Tips
mistakes
Here 曾 is the surname, read Zēng, not céng 'once' as in 曾经. His personal name 曾参 hides a second trap: 参 is traditionally read shēn, not cān. The 子 is an honorific, 'Master Zeng'.
culture
The idiom 曾参杀人, 'Zeng Shen has killed a man', comes from a story: a murderer shared his name, and three people in turn told his mother. She ignored the first two, but at the third she dropped her weaving and fled. It warns that repeated rumours shake anyone.
