Book 4: 《里仁》 Li Ren (Brotherliness)
《里仁》 Passage 4.22
子曰:「古者言之不出,恥躬之不逮也。」
Legge Translation (1861)
The Master said: "The reason why the ancients did not readily give utterance to their words, was that they feared lest their actions should not come up to them."