Book 4: 《里仁》 Li Ren (Brotherliness)
《里仁》 Passage 4.17
子曰：「見賢思齊焉，見不賢而內自省也。」
Legge Translation (1861)
The Master said: "When we see men of worth, we should think of equaling them; when we see men of a contrary character, we should turn inwards and examine ourselves."