Book 19: 《子張》 Zi Zhang
《子張》 Passage 19.13
子夏曰:「仕而優則學,學而優則仕。」
Legge Translation (1861)
Zixia said: "The officer, having discharged all his duties, should devote his leisure to learning. The student, having completed his learning, should apply himself to be an officer."