孜孜无怠

Explanation: Diligent efforts, not slack. 　　Source: Southern Liang Ren Kuang "Jingling Wenxuan Wang Qi lines like" your civility, Yi Send Classic Works, though led to physical labor, diligently not lazy, is written "four slightly." " 　　Examples: [Emperor Wu] diligent government, ~. Four months each winter more actually, Jichi the candle to see things, the Executive strokes cold hands as chap. ★ "Appreciative under beam Jizhong Wu Di"