The closing verdict of
贾谊《
过秦论》(Jia Yi, 'On the Faults of Qin,' Western Han, c. 170 BCE). Jia Yi's essay diagnoses why the Qin — after unifying China under Qin Shi Huang — collapsed within 15 years. The argument: Qin succeeded in 'attack' through Legalist harshness, but once it ruled the empire, it kept attacking instead of shifting to benevolent 'defense' — so the people rose up. This sentence is one of the most-quoted lines in Chinese political-historical writing and a standard text in Chinese high-school literature.