Book 16: 《季氏》 Ji Shi (The Ji Clan)
《季氏》 Passage 16.7
孔子曰：「君子有三戒：少之時，血氣未定，戒之在色；及其壯也，血氣方剛，戒之在鬭；及其老也，血氣既衰，戒之在得。」
Legge Translation (1861)
Confucius said: "There are three things which the superior man guards against. In youth, when the physical powers are not yet settled, he guards against lust. When he is strong and the physical powers are full of vigor, he guards against quarrelsomeness. When he is old, and the animal powers are decayed, he guards against covetousness."