曾子曰：“吾日三省吾身：爲人謀而不忠乎？與朋友交而不信乎？傳不習乎？ ”

Zeng Zi said，“There are three points on which I examine myself daily： Have I been conscientious in working for others？ Have I been truthful in my intercourse with my friends？ Have I practiced what I was tanght？”