Therefore, famine and dearth cannot be prepared against unless there are stored grains in the granaries, and justice cannot be maintained against the unjust unless there are ready weapons in the armoury. One cannot defend himself unless the inner and the outer city walls are in repair, and one cannot meet emergencies unless his ideas are well thought out. Thus Qing Ji was unprepared, and he should not have set out on the journey. Jie made no preparations against Tang and he was sent to exile. And Zhou made no preparations against Wu and he was executed. Now, Jie and Zhou were both emperors in rank and possessed the whole empire, yet they both perished at the hands of rulers (of states) of only a hundred li square. What is the reason for this? Because they depended on their rank and wealth and made no preparations. Therefore, preparation is what a country should emphasize. Supply is the treasure of a country, armament its claws, and the city walls are the stronghold of its self-defence. And these three items are the essentials to the existence of a state. 1. 仓 : Originally read: "食". Corrected by 孙诒让《墨子闲诂》
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