过而不改，是谓过矣 To err and not correct it, that is truly an error. (Confucius, Analects)
吾日三省吾身 Each day I examine myself on three points. (Zengzi, Analects)
人谁无过，过而能改，善莫大焉 Who is without faults? To err and be able to correct it, there is no greater good. (Zuo Zhuan)