Book 14: 《憲問》 Xian Wen (Xian Asked)
《憲問》 Passage 14.35
子曰：「莫我知也夫！」子貢曰：「何為其莫知子也？」子曰：「不怨天，不尤人。下學而上達。知我者，其天乎！」
Legge Translation (1861)
The Master said: "A horse is called a ji, not because of its strength, but because of its other good qualities."